Can't reproduce water leak

Brand new camper.
- Rolled in slight rain yesterday and no leaks.
- Massive rain during the night and today. No leaks.
- I am testing all system without 120v and with it. I tested the hot water heater on propane and used the bathroom sink. Shortly after I see this:


Use a towel to dry everything. Put a bucket under and wait. More massive rain; no leaks.
Use the hot water again. Still no leaks. It magically went away???