I'm seeing a lot of good feedback here, but I want to point out that it's all up to you
@DtheCatastrophist.
Say you have your mc thinking a certain way and you wanna contrast that way to show how they are different, sure there are good ways to do it in their pov, but a pov switch can be the kicker, and in those cases, a mid chapter switch would be best.
Or an example for myself, someone who just straight up sees something completely different and want to show how others might see the mc without breaking the story, then you want to have that be a different chapter unless they are following the same events.
Never make 2 chapters about the same scene though. You will just feel like your dragging out the story more than you actually are. It may seem like a great idea from a word count perspective, but at that point, you are just wasting people's time.
Flashbacks can be treated similarly, maybe you want to have your mc flashback to something to their past and it's relevant to the current topic, then you want that in the same chapter. But if you want to have an event outside of that chapters context then using a different one is best.
Best way to think of a chapter is just an extended paragraph. Paragraphs should ALWAYS contain the same core principle. If you change topics mid paragraph it just comes off as jarring. Don't over step your paragraphing and even more so, dont do more or less in your chapter than needed.
Come into it with a topic you want to show your audience, then build up to and end that topic. Parts can be split up after but by the time you end that chapter, you want the reader to have gone through a sort of mini arc. Or your reader will eventually get bored.
That is all I have for now. Have fun reading the wall of text lol.