Okay, again. I was making a boolean operation with some subdiv. Its very unstable (might look into that as well); when I pressed the overlay button, it crashed blender. So I booted up the autoback file and again, all my edge creases disappeared again. I think its due to the modifiers being layered and heavy boolean operations? Though I cannot explain why the crease info isnt backed up, or is just inconsistently backed up

Hi, I switched to blender recently so I cannot say if its a recent occurence.