It almost seems like they are assuming some catastrophe is around every corner.
If your boss says "hey got a moment to chat" you have a choice in how you react to the information. Assume they want to just chat and engage, or freak out and think the world is ending. Both options are possible, one has a nicer outcome. It's important to remember and remind yourself that you have control about how you feel about things.
I know I do work. I can justify my time, If my boss pulls me aside and redirects my work. That's totally fine, I work for them.
But generally, meetings invites and messages should contain lots of info and context. Chatting with your boss shouldn't be scary, if it is, maybe consider a new boss.