Comment 2 for bug 1947295

openstack_dashboard/wsgi/django.wsgi was deprecated in favor of openstack_dashboard/wsgi.py since Rocky release (commit 0ca736e5da47413db6749053e6083b82cbb24825) and was dropped in Wallaby (commit 7e682a2d528bcff992334d8792e33abbd57f5802).
This is the reason that you hit this issue when you tried Xena.

I believe it is not a horizon bug but a packaging bug of the RPM package you used.
I would suggest to report it to the horizon package you use.