Thanks for the report. I verified that the crash also occurs on an Intel Mac VM with Monterey beta 4 using the current python.org universal2 installers for 3.9.6 and 3.10.0rc1; they both have a private copy of Tk 8.6.11; so the problem does not appear to be Apple Silicon (M1) related. For what it's worth, the legacy python.org 3.9.6 Intel-only installer, which uses a copy of Tk 8.6.8, does not crash the Monterey beta 4. And no such failures are observed using any of those installers on the current Big Sur 11.5.1 release.