I've had my 2018 MBP either fail to go to sleep correctly or wake up during sleep twice while in a bag. When I got home it was blazing hot. I'm not alone in this, you can see threads of people reporting similar things on Apple's support forums or even in this thread. Apple isn't immune to this either.
It feels like you might've answered your own question. For better or worse, most of this kind of stuff "just works" in the Apple ecosystem.