Jack app do not like buffer size change. Document fixed buffer size.
I had issues where my jack apps (ardour, carla...) would crash when pausing/playing audio.
It took me a while to realize it was because of changing buffer size.
Thanks to: #569 (comment 777812)
It fixed my problem.
This issue is a request to document this (setting fixed quantum size) in big bold letters somewhere visible, it will save a few hours to many people trying pipewire.