bug with floor
https://www.youtube.com/watch?v=NM4btY0xdiE&feature=youtu.be&ab_channel=BLIND
Yup, I'v got the same bug, the yet-to-be-placed floor acts as a solid entity, so you will be able to float in midair. It is even worse if you have a floor next to the staircase, so you will hit your head on the green/red floor when walking up.
