So I wanted to see ghast vision but whenever I enter spectator mode, ghasts will just despawn. Even with a name tag. It's pretty obvious to reproduce the bug anyways, but I'll tell you all. Try a ghast without a name tag, then enter spectator. Then try it with a name tag.

I also looked for an issue with the likings of this, but did not find one, so don't hate all over me if it is a duplicate.