Odd Bug - Can't place Floor

Okay this bug will bug the devs.
I did not read anything about it … maybe I did miss it.
@moderators ??

I can not place floor or road on this area anymore:

you can try to draw a square of road/floor/slabs over this area but at most you will get what you can see.
The area will stay blank.

I do not know how this happened but before I encountered this bug I had a house on the same place and the floor did just vanish.
Maybe I did erase it with the rubber from the building tool, since I did try out some road placement and deleted part of this with the rubber a few times.

Here is the link to the save file:

Oh I am using some mods:

And I am using the latest steam unstable branch build


6 posts were merged into an existing topic: Erase and disappearing block