My colleague showed me his windows machine recently. The rubber on the back around the fans has melted from the times he forgot to shut it down and sleep didn't trigger when he packed it away in his backpack.
Linus tech tips on YouTube did a video about a windows bug where sleeping while charging would allow the laptop to wake up to check for updates etc but often caused this issue of turning on in a bag
It wouldn't happen that this feature was released around early/mid 2020? Windows sleep used to be semi-reliable but one it's been shit for a couple of years.
Search "LTT Windows Modern Standby" on YouTube. Sadly all the workarounds to turn it off no longer work reliably. For reliable sleep, buy a Framework (only current Windows laptop that still supports S3 Sleep) or Macbook.
