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I'm going to guess this is a shortcoming of pdb when it comes to frozen modules as I can get to the source using inspect (which pdb leans on)::
>>> len(inspect.findsource(_frozen_importlib)[0])
1761
>>> len(inspect.findsource(importlib._bootstrap)[0])
1761
Which are accurate line counts::
$ wc Lib/importlib/_bootstrap.py 
 1761 6236 62517 Lib/importlib/_bootstrap.py
So why gdb can't output the source line when it has the line number of the file I don't know when it can already get access to the source without issue.
And yes, debugging imports are hard. =) Still, it's better than before as you can easily toss in a print statement or two and then just regenerate the frozen object. But I do agree it would be nice to get gdb to play along with the whole situation (and thus the title change for this bug).