One user's calendar app is totally empy, literally empty page

Hi

I just upgraded the calendar app (which had an update avail) now one of the user’s calendar page is totally empty, please see the image to see what I mean.

Another user has their calendar shown fine.

Any recommendation?

Debian Testing, Php 7.4 Nextcloud 20.0.4, Apache, MariaDB

User is using Chromium on Linux

Has that user already cleared the browser cache?

Yes, even starting in Incognito did not help.

Is anyone else having this issue? It seems like this happens on Chromium Linux.

have you tried a different browser successfully?