Hi,FYI, this only happens if using python3-django 3:4.2.2-1 (form Experimental), it works perfectly with Django 3:4.2.2-1 from Bookworm / unstable.
Also, what fails is: /usr/share/openstack-dashboard/manage.py compress --forcemeaning that the issue is probably not in Horizon itself, but in one of the packages doing the JS / CSS compression.
Cheers, Thomas Goirand (zigo)