I had this problem with both left and right AirPods. I got a replacement, and a confirmation that it is a known issue. I currently live in Czechia, and there’re no official Apple stores here, but this hasn’t been a problem. I just had to wait a couple of days for the replacement.
Interestingly enough, I had a very similar issue with my Sony WH-1000XM3. They would click and pop whenever I moved my head, touched them, or simply when a door or window would open or close and produce a small change in air pressure. They would click several times in a row, every time with less intensity, before stopping. Extremely annoying. Just like with the Airpods, it would only happen with ANC on.
After a failed attempt to repair them in warranty, I just insisted on getting a new pair or my money back.
I am fairly confident that in both cases it was a hardware failure.
I have some friends that live in CZ and they still all call it Czech Republic and hate the new Czechia name. This is my first time hearing anyone refer to it by that name before.
I lived here before and after the official name change. Everyone I know still calls it "Czech Republic" - "Czechia" feels weird and unnatural to me.
Additionally it sounds quite close to "Čechy" - what in English we call "Bohemia" - which refers only to the western half of the country (see [1]). So it reminds me a little bit of when people call the UK "England" - so as a Scot living in Moravia I sympathise a little with some locals who feel a bit irked by it :-)
I read recently that one of the leaders of .cz likes the name and one of the leaders hates it.
I'm not a fan because to me it's too similar to Chechnya. In fact, that's what I thought the parent poster was talking about until your comment was posted.
The clicking/popping is a well-known issue for the Sony WH-1000XM2/3, and my wife had her XM2s refunded because of it. The pair of XM3 on my head has, so far, not shown any problems even while riding a bike in windy conditions.
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Interestingly enough, I had a very similar issue with my Sony WH-1000XM3. They would click and pop whenever I moved my head, touched them, or simply when a door or window would open or close and produce a small change in air pressure. They would click several times in a row, every time with less intensity, before stopping. Extremely annoying. Just like with the Airpods, it would only happen with ANC on. After a failed attempt to repair them in warranty, I just insisted on getting a new pair or my money back.
I am fairly confident that in both cases it was a hardware failure.