Tor Browser fails to connect over bridges. 100% CPU use after TB is closed

I have been using Tor Browser successfully for at least 8 years now. I connect using obfs4 bridges.

Recently in the past month or two I can not connect using bridges any more Tor Browser just can not establish a connection. The log provides one line:

ATTENTION: default value of option mesa_glthread overridden by environment.

Furthermore when I then exit Tor Browser there is a a process left running called 'tor' that uses 100% of a single CPU core.

I've downloaded a new Tor Browser package and installed it but the issues persists.

Tor Browser 13.5 Debian 13 Testing Kernel: 6.9.7-amd64