I wouldn’t overthink it to be honest.
Plenty of people run camper setups with gas bottles and still get serviced at VW without any issues. From what most have said, it’s never even been mentioned as a problem as long as everything’s installed properly and turned off at the bottle
If you want to play it safe, you could always take the bottle out beforehand — takes away any chance of a picky service advisor making a fuss. But realistically, it sounds like it’s rarely an issue.
Personally, I’d just make sure it’s shut off properly and leave it as is