Since some months, xpra has prevented upgrading Python and, as a consequence, many other packages (including for example Libreoffice). Since trixie has started freezing, I think gthat this is a release-critical problem with xpra.
I should add that Xpra shipped with Debian is at version 3, which is over 4 years old and unsupporterd upstream. Would be nice to have either version 5 (LTS) o version 6 (current)