Dragging a newly created .mogrt into a PPro timeline causes an instant crash

This morning I updated to the latest PPro beta and AE beta versions. I then created a brand new .mogrt in AE beta, saved it to a Library, then switched over to PPro beta and dragged the .mogrt from the library to my sequence's timeline, and it killed PPro.

I then reloaded PPro beta, did exactly the same, and it killed PPro again. I then loaded up the AE project in AE 2021, exported the same .mogrt into the same Library, switched to PPro 2021, dragged it to the sequence exactly as before and it worked perfectly, pointing to a new bug in today's (22 October 2021 UK time) release of AE or PPro.