Comment 26 for bug 1961508

Also, a few comments for debugging:

0. I agree that this is a pretty nasty bug for usability on an LTS release, it doesn't give a very professional feeling (which is too bad as otherwise Ubuntu 22.04 is amazing).

1. Not all windows end up underneath the dock, only some (and I can't identify a pattern).

2. I can't reliably reproduce the issue. On my setup it doesn't happen every time I unlock the screen, and it seems to happen less frequently in the first few unlocks after a full system restart. It gets worse after a few hours/days of system usage.

3. I'm using a laptop attached to an external HDMI display. The bug arises even if I boot the system directly with the external display and never use the laptop's display. I'm not sure whether I've experienced the issue when I use the laptop's display.

4. Every time I unlock the screen, it looks like there's always some flickering under the dock for the first few milliseconds. This seems to happen even when the bug does not arise, but it does look suspicious. Hypothesis: the position of the windows is reset every time after a screen unlock, and sometimes it happens that some windows are "left behind".