I just updated the script again, now it's leveraging lsb_release to pull the codename. I think this is what Ubuntu uses under the hood when utilizing add-apt-repository.

Just as some confirmation, can you verify if lsb_release -cs returns back the correct underlying OS on your system? And no biggie if you're busy, I'm curious but also confident it'll do a better job than the bash solution I came up with. The guess_debian_release() function in the accompanying script is already far more advanced than I expected, a testament to how hard it really is to determine what OS you're running now-a-days.
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No problem.
In Bullseye:

In Sid: (siduction actually, where find --maxdepth 1 would have broken)

Looks copacetic.
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