Flicker when navigating to subalbums starting from v6.9.4

[ktdd]

Lychee version

v6.10.4

Did you check the latest Lychee version?

Yes, I did

Which PHP version are you using?

PHP 8.4

Detailed description of the problem

When opening any subalbum, all subalbums flash. It's really distracting when you have tens of subalbums in the same album.

See video for explanation. I tested it on a clean, almost default installation of Lychee.

2025-12-14.11-22-49.mp4

After viewing a subalbum once, it doesn't flash anymore unless you refresh the page. Doesn't matter if browser caching is enabled or not. Happens on both Firefox and Chromium based browsers.

Because I was bored, I tested a couple of different versions.

v6.10.0 - flickers
v6.9.4 - flickers
v6.9.2 - does not flicker

Steps to reproduce the issue

1. Navigate to any album
2. Navigate to any subalbum

Diagnostics [REQUIRED]

Info
Lychee Version (release):                  6.10.4
DB Version:                                6.10.4
Docker:                                    false
composer install:                          --no-dev
APP_ENV:                                   production
APP_DEBUG:                                 false
APP_URL:                                   set
APP_DIR:                                   default
LOG_VIEWER_ENABLED:                        true
System:                                    Linux
PHP Version:                               8.4.11
PHP User agent:                            Lychee/6 (https://lycheeorg.dev/)
Timezone:                                  UTC
Max uploaded file size:                    30M
Max post size:                             100M
Chunk size:                                30.00 MB
Max execution time:                        200
SQLite Version:                            3.46.1
exec() Available:                          yes
Imagick Available:                         1
Imagick Enabled:                           1
Imagick Version:                           1810
GD Version:                                2.3.3
Number of foreign key:                     27 found.

version:                                   061004
check_for_updates:                         0
sorting_photos_col:                        taken_at
sorting_photos_order:                      ASC
sorting_albums_col:                        title
sorting_albums_order:                      ASC
imagick:                                   1
skip_duplicates:                           0
small_max_width:                           0
small_max_height:                          360
medium_max_width:                          1920
medium_max_height:                         1080
lang:                                      en
image_overlay_type:                        desc
default_license:                           none
compression_quality:                       90
grants_full_photo_access:                  1
delete_imported:                           0
mod_frame_enabled:                         1
mod_frame_refresh:                         30
thumb_2x:                                  1
small_2x:                                  1
medium_2x:                                 1
landing_page_enable:                       0
search_public:                             0
hide_version_number:                       0
recent_age:                                1
grants_download:                           0
photos_wraparound:                         1
map_display:                               0
zip64:                                     1
map_display_public:                        0
map_provider:                              Wikimedia
map_include_subalbums:                     0
update_check_every_days:                   3
has_exiftool:                              1
share_button_visible:                      0
import_via_symlink:                        0
has_ffmpeg:                                1
location_decoding:                         0
location_decoding_timeout:                 30
location_show:                             1
location_show_public:                      0
rss_enable:                                0
rss_recent_days:                           7
rss_max_items:                             100
prefer_available_xmp_metadata:             0
editor_enabled:                            1
lossless_optimization:                     0
local_takestamp_video_formats:             .avi|.mov
log_max_num_line:                          1000
unlock_password_photos_with_url_param:     0
nsfw_visible:                              1
nsfw_blur:                                 0
nsfw_warning:                              0
nsfw_warning_admin:                        0
nsfw_banner_override:                      
map_display_direction:                     1
album_subtitle_type:                       oldstyle
upload_processing_limit:                   4
new_photos_notification:                   0
zip_deflate_level:                         6
default_album_protection:                  1
album_decoration:                          layers
album_decoration_orientation:              row
allow_username_change:                     1
auto_fix_orientation:                      1
random_album_id:                           starred
use_last_modified_date_when_no_exif_date:  0
layout:                                    justified
date_format_photo_thumb:                   M j, Y, g:i:s A e
date_format_photo_overlay:                 M j, Y, g:i:s A e
date_format_sidebar_uploaded:              M j, Y, g:i:s A e
date_format_sidebar_taken_at:              M j, Y, g:i:s A e
date_format_hero_min_max:                  F Y
date_format_hero_created_at:               M j, Y, g:i:s A T
date_format_album_thumb:                   M Y
upload_chunk_size:                         0
nsfw_banner_blur_backdrop:                 0
search_pagination_limit:                   300
search_minimum_length_required:            4
photo_layout_justified_row_height:         320
photo_layout_masonry_column_width:         300
photo_layout_grid_column_width:            250
photo_layout_square_column_width:          200
photo_layout_gap:                          12
display_thumb_album_overlay:               always
display_thumb_photo_overlay:               hover
default_album_thumb_aspect_ratio:          1/1
use_album_compact_header:                  0
back_button_enabled:                       0
back_button_text:                          Return to Home
SA_random_thumbs:                          0
login_required:                            0
enable_unsorted:                           0
enable_starred:                            0
enable_recent:                             0
enable_on_this_day:                        0
login_required_root_only:                  1
dark_mode_enabled:                         1
low_quality_image_placeholder:             1
show_keybinding_help_popup:                1
show_keybinding_help_button:               1
disable_se_call_for_actions:               0
enable_se_preview:                         0
slideshow_timeout:                         5
keep_original_untouched:                   1
timeline_photos_enabled:                   1
timeline_photos_public:                    0
timeline_photos_granularity:               day
timeline_photos_order:                     taken_at
timeline_photos_layout:                    square
timeline_photos_pagination_limit:          200
timeline_albums_enabled:                   1
timeline_albums_public:                    0
timeline_albums_granularity:               year
timeline_left_border_enabled:              1
timeline_photo_date_format_year:           Y
timeline_photo_date_format_month:          M Y
timeline_photo_date_format_day:            j M Y
timeline_photo_date_format_hour:           g:i
timeline_album_date_format_year:           Y
timeline_album_date_format_month:          M Y
timeline_album_date_format_day:            j M
hide_nsfw_in_smart_albums:                 1
hide_nsfw_in_frame:                        1
hide_nsfw_in_map:                          1
hide_nsfw_in_search:                       1
search_photos_layout:                      square
hide_nsfw_in_rss:                          1
hide_nsfw_in_timeline:                     1
number_albums_per_row_mobile:              3
cache_enabled:                             0
cache_ttl:                                 86400
low_number_of_shoots_per_day:              10
medium_number_of_shoots_per_day:           50
high_number_of_shoots_per_day:             100
maintenance_processing_limit:              5000
disable_recursive_permission_check:        1
exif_disabled_for_all:                     0
file_name_hidden:                          0
default_old_settings:                      0
default_expert_settings:                   0
default_all_settings:                      0
client_side_favourite_enabled:             0
disable_thumb_download:                    1
disable_thumb2x_download:                  1
disable_small_download:                    0
disable_small2x_download:                  0
disable_medium_download:                   0
disable_medium2x_download:                 0
temporary_image_link_enabled:              0
temporary_image_link_when_logged_in:       0
temporary_image_link_when_admin:           0
temporary_image_link_life_in_seconds:      86400
secure_image_link_enabled:                 0
SA_override_visibility:                    0
TA_override_visibility:                    0
enable_colour_extractions:                 0
colour_extraction_driver:                  farzai
home_page_default:                         gallery
timeline_page_enabled:                     1
timeline_quick_access_date_format_year:    Y
timeline_quick_access_date_format_month:   M
timeline_quick_access_date_format_day:     j M
timeline_quick_access_date_format_hour:    h M, g:i
flow_enabled:                              1
flow_public:                               0
flow_base:                                 
flow_max_items:                            10
flow_strategy:                             auto
flow_include_sub_albums:                   0
flow_include_photos_from_children:         0
flow_open_album_on_click:                  0
flow_display_open_album_button:            0
flow_highlight_first_picture:              1
flow_min_max_enabled:                      1
flow_display_statistics:                   1
flow_compact_mode_enabled:                 1
flow_image_header_enabled:                 1
flow_image_header_cover:                   cover
flow_image_header_height:                  24
flow_carousel_enabled:                     1
flow_carousel_height:                      6
date_format_flow_published:                M j, Y, g:i:s A e
date_format_flow_min_max:                  F Y
flow_blur_nsfw_enabled:                    1
hide_nsfw_in_flow:                         1
skip_duplicates_early:                     1
sync_delete_missing_photos:                0
sync_delete_missing_albums:                0
sync_dry_run:                              1
gallery_header_enabled:                    0
gallery_header_logged_in_enabled:          0
gallery_header:                            
gallery_header_bar_transparent:            1
gallery_header_bar_gradient:               1
import_via_url_forbidden_localhost:        1
import_via_url_forbidden_local_ip:         1
import_via_url_require_https:              1
import_via_url_forbidden_ports:            1
details_links_enabled:                     0
details_links_public:                      0
is_scroll_to_navigate_photos_enabled:      1
is_swipe_vertically_to_go_back_enabled:    1
photo_thumb_tags_enabled:                  0
hide_nsfw_in_tag_albums:                   1
hide_nsfw_in_tag_listing:                  1
sorting_pinned_albums_col:                 created_at
sorting_pinned_albums_order:               DESC
copyright_text:                            
watermark_enabled:                         0
watermark_photo_id:                        
watermark_public:                          1
watermark_logged_in_users_enabled:         0
renamer_enabled:                           0
renamer_enforced:                          0
renamer_enforced_before:                   0
renamer_enforced_after:                    0
renamer_photo_title_enabled:               1
renamer_album_title_enabled:               1
extract_zip_on_upload:                     1
webshop_currency:                          EUR
webshop_default_description:               No description provided.
webshop_allow_guest_checkout:              1
webshop_terms_url:                         
webshop_privacy_url:                       
webshop_default_price_cents:               0
webshop_default_license:                   personal
webshop_default_size:                      medium
enable_untagged:                           0
photos_pagination_limit:                   500
deduplicate_pinned_albums:                 0
desktop_dock_full_transparency_enabled:    0
mobile_dock_full_transparency_enabled:     0
import_via_url_block_redirect:             1

Browser & System [REQUIRED]

Tested on latest Firefox, Chrome, Edge on both Windows 11 and Ubuntu.

Please confirm (incomplete submissions will not be addressed)

• I have provided easy and step-by-step instructions to reproduce the bug.
• I understand my bug report will be removed if I haven't met the criteria above.
• I understand that if I am requested to provide more information, I must do so within 14 days or the bug report will be closed.

[ktdd]

v6.9.4:

I tried replacing public/build/assets/app-COqeoNJq.css with css from 6.9.2, still flickers. Every other css file seems to be the same so the problem is elsewhere.

Tried copying complete public/build directory from 6.9.2 to 6.9.4, flicker is gone.

[ildyria]

I believe this is not a CSS issue, but a JS issue with the way the loading of albums are handled and the re-rendering. I noticed it but I haven't had time to dive into it too.