Using Ardour 8.1 downloaded from here on WIN10. I have reopened the tracker issue and updated the notes to reproduce. A MIDI file that crashes WIN10 is in the tracker.
Ardour 8.1 from here on Ubuntu 22.04 LTS works as expected.
Here is another Windows specific MIDI related crash. Crashes with multiple successions of pastes of a single MIDI region on a single track. (Ctrl-C), (Ctrl-v-v-v-v-v-v-v-v-v)