I mistakenly left this on a similar thread that had been closed as a duplicate so wanted to repost it here. I've performed fresh installs of Blender multiple times and disabled all addons. I hope to try again when new Macs are available but unfortunately for now I will have to move back to Modo.

Had to move to a 2019 iMac running 10.14.6 (18G8022) temporarily and hair works fine. Still crashing on leave and return though. 2.92.0 2021-02-25

This has rendered Blender almost unusable for me. If I leave Blender for a few minutes it will crash when I begin working again. The only way I can preserve a rendering is to have it written to disk before touching Blender again which reduces the effectiveness of the compositor substantially. This is on a 2019 iMac running 10.14.6 (18G8022). This is consistent with my experience on a 2013 Mac Pro running Catalina.
Model Identifier: iMac19,2

Processor Name:	Intel Core i5
Processor Speed:	3 GHz
Number of Processors:	1
Total Number of Cores:	6
L2 Cache (per Core):	256 KB
L3 Cache:	9 MB
Memory:	32 GB
Boot ROM Version:	1554.80.3.0.0
SMC Version (system):	2.47f2

Hi. If I turn Physics Type to "None" with the Particle Type set to "Emitter" and then switch to "Hair" Blender does not crash. However no hair is generated. Maybe a clue??