EDIT: Lol, it doesn’t actually work +___+ It is enabled in KeepassXC but it just doesn’t do anything. Welp.
Here’s a neat trick I just found out (with a hint from here):
In Wayland you can’t use KeepassXC’s very cool Auto-Type feature (it’s somehow Qt’s fault?) but if you installed it as a Flatpak you can go into KDE Settings, search for “Flatpak Permission Settings” and in the settings for KeepassXC under “Advanced” you can disable “Wayland Windowing System” to make it work. Nice!
The old security vs ease-of-use problem. It's kinda a hassle to copy-paste all this logins and passwords (haven't done it in a long time). Switched to Wayland now because gaming seems to be better (had some nasty screen-tearing on Xorg and possible borked my monitor setup while trying to fix it).
It will get better, but controlled. Through portals, with permissions and all.