Browser extension works for local zotero bib but not for the web library.

Hi everybody,
it's my first time posting here. I have a Zotero Browser plugin extension for Chrome, which has worked great in the past. Since the last two days, every time I want to add an item via the plugin, the reference is added to the local library on my computer, but not to the Web library somehow. It seems strange because I understand the local bib as a synchronized replica. However, the web library doesn't display any results when searching for the items, nor are the added references displayed in the linked Overleaf file.

I already updated the Zotero plugin, restarted Chrome multiple times, and still have more than enough storage space. Does anybody know what this is and how I can solve this?
Thanks!
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