Am running UM 22.04. Just noticed that sometime in the last 5 days or so, the ability to invoke the emojis window using ctrl+. or ctrl+; has gone away. For example, open pluma and try the key combination; see a small e displayed. A subsequent press of ctrl+. causes the cursor to back over the e and erase it. The right click menu method of inserting emojis still works fine.
Have checked the Language Support app, which appears fine. (US English) Keyboard Preferences app shows US English keyboard correctly. iBus Preferences app, emoji tab, shows the correct shortcuts.
I tried this in an up to date version of UM 22.10 running in a VM on the same machine and could not repeat the "bad" behavior.
Clearly not a big deal, but I thought that I would mention it. Perhaps a very recent update had an unintended side effect.