[Android] Sync with Android app not reliable

The sync between Android and my online data is not working properly (extremely slow and unreliable).
The main issue is that I never know if or when the annotations or changes to a file will eventually be synced.

For example, here is the annotation status on my desktop app:

188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/hetr6wx0djgm16hgwf5x.png

I made sure that this was properly synced to the online library:

188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/o1v8ur6dekqnu3pdwusa.png

Then I do a "Start Logging on Next App Launch" on the Android app and restart the phone.188BET靠谱吗After restart, I start the Zotero app on the Android phone, and let it run until the end, to make sure that everything should be properly synced.

188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/9vqf3ms3wj21cmev500u.png

The Debug ID is: D1032718744

188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/fnm33kraihi810kk2kr1.png

The result I get in the Android app for the same item is:

188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/ursa6wb0ez3tin5mwo2x.png

The sync is taking forever, maybe due to this:
188BET靠谱吗https://forums.zotero.org/discussion/115259/android-syncing-count-showing-the-same-number-for-all-libraries

So I cannot really repeat the process to understand what is happening.
I don't know what is causing the "113 issues" (and growing).
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