Collapsed headers opening when I don't tell them to

What I’m trying to do

I never had this problem, but suddenly when I do something like paste into a bullet point, a collapsed header or bullet point below it will suddenly open up and show everything inside. I didn’t ask it to open up. I don’t want it to open up unless I tell it to.

Example:

  • blah blah
  • (I paste something)

this header is collapsed before I paste something

  • now all of the stuff inside is visible because after I paste above, the header is no longer collapsed

Things I have tried

I scanned through the changelog and settings, I searched “collapse” and looked around.

EDIT: it seems inconsistent too, like if I paste “change test” it’ll open the below header, but if I paste “the bomb” it won’t. ???

moved to help for not following bug report template