Ibus (Input Method) seems not working properly under Wayland

[Nyaacinth]

I want to ask if there's any official support for input methods under Pantheon's Wayland session. Because I started to use the Secure Session by elementary OS 8.1, and found out that ibus is either not showing candidates (for most of internal apps) or not working at all (for almost all external flathub flatpaks.) I tried to set environmental variables GTK_IM_MODULE/QT_IM_MODULE but that only works for xwayland apps. So as the last resort I reverted my settings to Classic Session (X11) and that fixed everything. 🫠
I searched and saw someone talking about ibus candidates not showing up, which is probably related. And I'm using ibus-libpinyin for Chinese and ibus-mozc for Japanese, and yes, they shares similar symptoms under Wayland.

[Nyaacinth]

Btw xwayland's hidpi behaviour is a bit weird. I knew that fractional scaling won't work well, so I set scaling to 200%, but it is still blurry even under 200% scaling... 😭
I tried to find solutions on ArchWiki, but there isn't any.
I will open this as a separate thread if necessary.

[ryonakano]

Yes, it's a known issue of OS 8.x that IBus candidate window is not shown: elementary/gala#2529