[Tkinter] ttk-->treeview-->tag_configure() not work over Python3.6

[hqbfljx]

Hi everyone, I am new comer of this forum.
I got a problem relate to the with the ttk treeview:
### With the Python 3.6.12 the ttk-->treeview-->tag_configure() work ok which it can change the background color expectedly.
### But with the Python3.7 or later, it not work with the same codes that work in Python3.6.12

What is the problem? who knows?