Is this a platform where 3.8 was working?

The curses test seems to think you have too many color-pairs defined, and this might well be part of a semi-compatible curses library. I guess I would add some output to the test showing how many (and which) color pairs it thinks there are.

The pwd complaint is correct, but seems like it is complaining about the interface between python and your OS.

The tkinter problem is really a failure to round a floating point, and I would be surprised if python had made changes there recently.  I would be slightly less surprised if something in the compile chain of tk for your system hard-coded a specific rounding format.