Upgrading to 23 with existing Collabora CODE server

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Nextcloud version (eg, 20.0.5): 23.0
Operating system and version (eg, Ubuntu 20.04): FreeNAS Jail (12.2-RELEASE-p2)
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.25
PHP version (eg, 7.4): 7.3

The issue you are facing: On Nextcloud 22.2.3 my Collabora CODE, running on a local VM, is working fine. After upgrading to NC23, it doesn´t open CODE, the clicked document simply downloads instead. It works witha Collabora demo server, though.

Is this the first time you’ve seen this error? (Y/N): YES

Steps to replicate it:

  1. Upgrade to Nextcloud 23
  2. Browse to my cloud in a web browser
  3. Click any office document and watch it download instead of opening in the browser

I don´t think there´s anything wrong with my config, I simply wonder if I need to change anything after upgrading to make Collabora work again. It connects fine in Settings, but just won´t work.
I rolled back to a working snapshot when I discovered this, so I really don´t have much of logging / config post upgrade.