Files won't load after 26 to 27 upgrade

I see my files in webdav, but the Web UI doesn’t properly load the files app, all other apps work.
Server is ubuntu 22.04, postgres database

What could cause this?

This is in the log

Debug no app in context Deprecated event type for OCA\Files::loadAdditionalScripts: 2023-09-11T12:30:54+02:00
Symfony\Component\EventDispatcher\GenericEvent is used

Debug no app in context Deprecated event type for \OCP\Collaboration\Resources::loadAdditionalScripts: null 2023-09-11T12:30:54+02:00

Debug serverDI The requested alias “SystemConfig” is deprecated. Please request “OC\SystemConfig” directly. This 2023-09-11T12:31:01+02:00
alias will be removed in a future Nextcloud version.

Info related_resources Could not resolve OCA\Circles\CirclesManager! Class “OCA\Circles\CirclesManager” does not exist

mountsfilelist.js?v=53dff782-0:29 Uncaught TypeError: Cannot read properties of undefined (reading ‘prototype’)
at mountsfilelist.js?v=53dff782-0:29:55
at mountsfilelist.js?v=53dff782-0:149:3
In web developer tools, that seems to be the issue