Upstream in the 5.2 branch the API version is defined as 5.2+:

https://github.com/bugzilla/bugzilla/blob/6525e6d90f15fed7d87f591f38f5578ce403dc1b/Bugzilla/Constants.pm#L203

Unfortunately, python-bugzilla expects to split version on the . and retrieve two ints:

Bugzilla version string: 5.2+
version doesn't match expected format X.Y.Z, assuming 5.0
Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/bugzilla/base.py", line 447, in _set_bz_version
    major, minor = [int(i) for i in version.split(".")[0:2]]
                    ~~~^^^
ValueError: invalid literal for int() with base 10: '2+'

We've dropped the + in the Gentoo Bugzilla in the interim, but clearly the current handling does not reflect the reality of modern Bugzilla. The fallback to 5.0 is "fine", but ideally we would strip the + or something so that we:

1. get accurate version information
2. don't display a traceback when we connect to the API