And I'm getting this in the command line when the process fails:
/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 73 leaked semaphore objects to clean up at shutdown warnings.warn('resource_tracker: There appear to be %d '