Terry J. Reedy <tjre...@udel.edu> added the comment:

3.6 only get security fixes, but your nice minimal, complete verifiable example 
let me verify easily on 3.9a5 with tk 8.6.9 and 3.6 with 8.6.6 and 2.7.17 with 
8.5.19. The hidden element appears to be something like'||' with only part 
visible, depending on the scale value.  It at least partly obscures from -20 to 
15.  (Clicking the bar moves 1 unit at a time.)  This should be tested on other 
systems, but I suspect that this is an upstream tcl/tk issue.

----------
nosy: +serhiy.storchaka, terry.reedy
versions: +Python 3.7, Python 3.8, Python 3.9 -Python 3.6

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