Google chrome uses wrong keyboard input method
If you have set English or something else as a second language in Google Chrome (Settings -> Advanced -> Languages), try removing it and restart Chrome (!). That fixed the issue for me. I then added English back and it still works.
(At the same time, I updated Chrome to 96.0.4664.93, maybe that helped, too.)
Solution from https://www.reddit.com/r/kde/comments/onj4t0/kde_on_wayland_changes_the_keyboard_layout_cf_kde/