It's funny, because I had the same "what bugs?" response as the parent. After reading your list, I realized that we just use the browser very differently.
I never save images from the web on my phone. I didn't even know you could switch tabs by swiping the address bar (I always open the tab menu). I'd never noticed the "sign in to sync" issue (just checked and I do see the same behavior you see), but it's just a harmless display bug IMO, that doesn't affect functionality. I've never seen the issue where opening the tab menu scrolls to a random place. I rarely use reader mode on mobile, and haven't noticed the theme issues.
The only one I've seen from your list is where reopening a closed tab moves it to the top of the list. But I do that so infrequently that it doesn't bother me.
I never save images from the web on my phone. I didn't even know you could switch tabs by swiping the address bar (I always open the tab menu). I'd never noticed the "sign in to sync" issue (just checked and I do see the same behavior you see), but it's just a harmless display bug IMO, that doesn't affect functionality. I've never seen the issue where opening the tab menu scrolls to a random place. I rarely use reader mode on mobile, and haven't noticed the theme issues.
The only one I've seen from your list is where reopening a closed tab moves it to the top of the list. But I do that so infrequently that it doesn't bother me.