Thanks for your report. No, I don't think that you did anything wrong here. I will look into it!
Viewing post in [RPGMaker MV & MZ] Random Maps comments
Thank you very much for looking into it.
I've also since discovered that opening and closing the main party menu causes the same "returned to snippet space map" behavior to happen, and that this behavior also occurs in the provided random sample maps demo project for MV, at least for me. Let me know if I can at any point provide any additional information that may be helpful, and thank you again for your time.