The leaves break to discourage camping in trees, if the logs didn't break that would be pretty useless as you could just stand on a log and still camp in a tree.
I wouldn't classify it as a glitch, but I'm sure what you're doing wasn't intended as it actually makes camping easier rather than harder. I've never actually seen a player do this but it does sound like a bit of a problem. I personally do not like the map that features these trees, so I'd be happy to see the map and anti-camping mechanic removed altogether (as long as we got another map in return). I doubt that management are going to make any changes to Snowman Survival before it's removed, however if it's coming back next year then this is an issue that needs to be addressed. Until then I'd say it is allowed. Though it may be somewhat unfair, you're not going to be banned for bug abuse when it's so intuitive and easy to accidentally do, and camping is allowed in a hide-and-seek game with no stalemates so you'll be fine there too.
