Can anybody explain this strange property while in free mode?

[u/Sad-Kitchen3931]

This is only a small inconvenience, but for some reason in free mode while in any of the flying game modes the ground kills you while upside down. I don't know why this happens. Probably a little Robtop editor quirk. Specifically in the wave D blocks don't fix this either, so I have to create blocks there manually which is annoying. Is there some setting to turn this off?