Preparing packaging for Bleachbit 6.0.0 for Debian I found a regression about open as root and found that polkit was the cause: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136196
Today preparing the 6.0.2 issue was still present and I search the exact cause and found.
On Debian I did a patch to workaround it and have working on both older and newer polkit I think will be useful also here: https://salsa.debian.org/python-team/packages/bleachbit/-/raw/debian/master/debian/patches/Add-polkit-action-with-canonical-program-path-for-pkexec-.patch?ref_type=heads