AirPods make this screeching sound whenever I put them in noise cancelling mode or transparency. Guessing it has to do something with the external mics being damaged. : r/airpods
UPDATE] Many Apple Users Complain Of High-pitched Screeching Noise While Using Apple Music After The Latest Update
Squelching/Squeaking sound in right airpod pro when walking or adjusting pod : r/airpods