test_from (tkinter.test.test_tkinter.test_widgets.ScaleTest) is currently failing on Arch Linux, and at least another place: https://python-build-standalone.readthedocs.io/en/latest/status.html

The error looks like:

======================================================================
FAIL: test_from (tkinter.test.test_tkinter.test_widgets.ScaleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python3.8/tkinter/test/test_tkinter/test_widgets.py", line 939, in test_from
    self.checkFloatParam(widget, 'from', 100, 14.9, 15.1, conv=float_round)
  File "/usr/lib/python3.8/tkinter/test/widget_tests.py", line 106, in checkFloatParam
    self.checkParam(widget, name, value, conv=conv, **kwargs)
  File "/usr/lib/python3.8/tkinter/test/widget_tests.py", line 64, in checkParam
    self.assertEqual2(widget.cget(name), expected, eq=eq)
  File "/usr/lib/python3.8/tkinter/test/widget_tests.py", line 47, in assertEqual2
    self.assertEqual(actual, expected, msg)
AssertionError: 14.9 != 15.0

It's the only failure in the current Python 3.8.4 release's test suite here. Also adding Python 3.9 and 3.10 as I am able to reproduce it on master too.