Anyone had problems with x3 leaking? It's not waterproof?

when using the camera underwater, without dive case because it was 20cm depth for a few minutes (I still have videos), the camera reported a card error. after wiping it and removing the battery, it turned out that there was some moisture inside, a trace amount of water. the battery and charging socket are closed properly, the battery seal is not damaged. the camera is advertised as waterproof, beautiful videos and marketing photos confirm this, but I just found out that the warranty does not cover this situation. I don't know how the water got there, but I'm curious who was there and what they did in such a situation and what the manufacturer had to say about it?