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I had the same thing happen. At first only the right AirPod would squeal when pressed, but then I tried swapping them around — left in the right ear, right in the left — and the one that was fine started squealing too.
So it looks more like a software or firmware quirk rather than a defect in a single earbud
 
My AirPods Pro 3 are experiencing the same issue. When I enable noise cancellation mode, my earbuds emit a sharp whistling sound while I'm chewing food, looking downward, or lying flat with my head tilted to one side. I returned them to the official store and purchased a new pair, but the same problem persists. As a user in China, I've found many others sharing identical experiences. Some users even reported that during flights, when attempting to activate noise cancellation, the whistling sound continued throughout the entire journey until the plane landed. This seems to indicate a potential flaw in the product design. I consulted with the Genius Bar staff, and they informed me that this issue might be improved through future firmware updates. However, they couldn't guarantee it. I've now decided to return the product and will temporarily refrain from purchasing AirPods Pro 3 until this problem is completely resolved.
I must say, after a day, the problem came back, so I returned them and are now wearing the wired ones. I will also refrain from buying another pair until this problem is acknowledged and resolved.
 
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Just posted this question on another thread about similar experiences. Just out of curiosity, did you guys experience squeal when blowing nose with AirPods in? I got very loud squeal in left ear. So unbearable I sent my APP3 back and bought a new pair of APP2.
 
I experienced this with the original APP but not the 2 and 3. Figured it was just an issue with the original APPs but I guess I had a defective set.
 
I’m on my second pair of APP3 now. Same issues present. This has to be a software issue.

Whistling sound isn’t reproducible every time, however I can consistently force them to cutout covering both my ears. Reproducing what happens when wearing a hat that covers my ears of when lying in bed.
 
Have you guys tried a one size smaller ear tips? For me it, if not completely eliminate, but radically lessened the problem. I hardly hear whistling anymore. Still I think software update is needed as the source of the problem is most likely settings of the internal mics.
 
Have you guys tried a one size smaller ear tips? For me it, if not completely eliminate, but radically lessened the problem. I hardly hear whistling anymore. Still I think software update is needed as the source of the problem is most likely settings of the internal mics.
I did try all the tips sizes, even tho some did minimize the whistle sound, it was still annoying to have it on. Sometimes it would start whistling at a lower volume and get increasingly louder.
 
After using the APP3s a number of times in a noisy environment I'm still getting the initial white noise sound. Interestingly it's only in a noisy environment and it only noticeably happens with the first bud I insert and it dies down once the bud is inserted so it feels as though it might be some kind of issue with the in ear microphone, the algorithm and the pressure of inserting the bud.

It equalises quite quickly and doesn't happen again so hopefully a tweak in the FW will solve it.
 
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