Custom emoji displayed pixelated/blocky

[LingMan]

Describe the bug

Custom emojis in messages are displayed very pixelated/blocky. The exact same message renders correctly in Cinny.

To Reproduce

Example message content is:

{
    "content": {
        "body": ":frog_weary:",
        "format": "org.matrix.custom.html",
        "formatted_body": "<img data-mx-emoticon height=\"32\" src=\"mxc://frog.dance/cDw1cLOVruD2zZv79aQFqCneqet6fria\" title=\":frog_weary:\" alt=\":frog_weary:\">",
        "m.mentions": {},
        "msgtype": "m.text"
    },
    "event_id": "redacted",
    "origin_server_ts": redacted,
    "room_id": "redacted",
    "sender": "redacted",
    "type": "m.room.message",
    "unsigned": null
}

What happened?

No response

Expected behavior

No response

Screenshots

Correct rendering (Cinny):

Blocky rendering (nheko):

Version

0.12.1-7

Operating system

Linux

Installation method

Some repository (AUR, homebrew, distribution repository, PPA, etc)

Qt version

6.10.2-1

C++ compiler

No response

Desktop Environment

KDE x11

Did you use profiles?

• Profiles used?

Relevant log output

Backtrace