Zotero can't stop syncing to WebDAV

Hi, I use zotero to sync files with my own NextCloud WebDAV in my NAS. It use HTTP to sync. It's normal to verify server and indeed it can sync data to WebDAV (I have tried to add new item and the new item can be found in another computer). However, zotero always showing "Sync with zotero.org" (icon rotating) and it can't stop by the Stop button. If I disable file syncing, it will become fine.

How do I debug this or solve this problem? Thanks in advance~
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