I’ve had my AirPods Pro for two years now and I’ve had to have both (left and right) replaced twice because of this. Unfortunately they are now out of warranty. I hope 2nd gen doesn’t suffer from something like this.
I was worried they would blame my third-party tips (https://www.complyfoam.com/collections/comply-foam-tips-comp...) but as mentioned by the other poster, they remove the tips before testing.
I got them replaced in Spain while the original purchase took place in Germany.