dark mode/theme not working

[lucyferu]

Describe the bug

dark mode doesn't activate when nextcloud has dark theme on

Context

• Hardware: VPS bought online
• YunoHost version: 11.1.17 (stable)
• I have access to my server: Through SSH | through the webadmin
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no
• Using, or trying to install package version/branch: 22.05.8.2~ynh2

Steps to reproduce

turn dark theme on the nextcloud appeareance settings and then open a document through collabora.
the page will still be white with black font as by default.

Expected behavior

just working on a document with dark theme/mode on.

[lucyferu]

hoping someone will pass by and check this at some point. 😅