Honestly, I don't remember any more. Once Android 11 went public, I couldn't find how to access my previous bug reports, so it was a mental note of what they were.
Some minor, some extremely frustrating.
A few from memory:
Notification panel pull-down, the bottom gets "stuck" at fixed position and you have to dismiss the panel and pull down again.
Tapping an email notification often opens the inbox rather than the actual email, which then clears all unread email notifiations.
Video recording (whether motion photo, actual video, or "single take" is often jittery.
Similarly, video playback gets jittery when there's UI overlaying it too (such as the volume bar).
A few were about Conversation Bubbles - they're just broken - they often stop appearing, and you just get a notification or old-style notification. Bubbles also always appear in the top left corner, regardless of where they were when dismissed/closed - no good for a right-handed one-handed operation. Often tapping the bubble just causes it to disappear.
Another was gallery related - if you tap a photo to view it, then swipe up, the information is lacking on Android 11. I can't remember what was missing now, but it was no longer as useful as on Android 10 and you had to tap a "more info" type icon to view the full info, so added an extra step.
