The only bug I'm having with Sync for Lemmy is that it does lots of wakelocks in the background, I had to set the app to restricted mode in the battery settings as a workaround.
I don't know if this is because it tries to fetch notifications (a feature not available yet) or IDK.
Setting it up to "restricted" instead of "optimized" basically fixes idle issues, although I can see the app refresh a lot more than when it is optimized...
Sync for Reddit never had this issue, I always had it in optimized mode and it barely was active in the background.
Pictures for reference:


EDIT: I am experiencing this issue with AOSP, with MIUI I did not, but I'm guessing it is only because MIUI is more aggressive with apps in the background.
EDIT 2: Also I'm seeing a new gap just below the main post in the newest version ๐
