https://bugzilla.redhat.com/show_bug.cgi?id=1751061
--- Comment #2 from fujiwara tfujiwar@redhat.com --- I cannot reproduce your problem. I use Japanese 109 keyboard and the preedit does not disappear in both Wayland and Xorg. Probably I'd suggest you to check if another key evnets are sent in GtkEvents after you type the Multi_key. Unfortunately xev checks XEvents only you might need to create a scratch program.