I have first added the 3 highlights in the left column in the desktop reader:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/qk347q4sbze051j2p7mm.png

I have then synced, and confirmed that the new highlights are visible in the PDF Reader of the Web Library:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/m9lm0fftzq1fiaqvmwhs.png

Then leaving the PDF Reader of the Web Library opened, I have deleted the blue highlight and added the green highlight in the right column:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/befun20gxgnh6k6qmy0j.png

Then synced again.
The Added green highlight automatically appears in the web library, but the deleted blue highlight is still there:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/o04qex0jh9f3ahagqcm9.png

If I refresh the page in the web library, all the changes appear correctly:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/s076kj6sxs1nr1hx5sbd.png

Is it possible to automatically refresh all changes (additions and deletions) without having to refresh the page?

Zotero 7.0.1-beta.3+ec7ffa8c0 (64-bit)
Windows 10
Firefox 129.0.1 (64-bit)