I can't seem to reproduce that, maybe it could be a tk issue ?

Can you try writing anything (that doesn't work on IDLE) on a
tkinter.Text widget to see if it shows there ? You could use this code
below:

from tkinter import Text

text = Text()
print(text.tk.call('info', 'patchlevel'))
text.focus_set()
text.pack()
text.mainloop()