Dear Andy,
thank you very much (and once again) for flactag and also for your swift
response. Sorry for not checking the GitHub repository right away. It
would still be an exaggeration if I said that I very seldomly report
bugs and so I assumed that any error fixed elsewhere would make it
upstream into Debian relatively soon, especially when it affects the
overall functionality of the package so much.
About your workaround that is exactly the same way I use with much
simplier BASH and Python scripts when running into user agent issues
myself. Getting your user agent registered would at best only be a waste
of time.
I just put my even more seldomly used knowledge on building Debian
packages to the test, reactivated the deb-src-entries, downloaded the
Debian flactag source, "integrated" the patch you mentioned into the
downloaded source code and have a working installation once more.
Hopefully the patch will be integrated soon and become an additional
reason to look forward on trixie.
Again: thank you very much for flactag. I really appreciate it a lot!
Best,
sok