Building with slab tool, and can not erase/ delete with the eraser tool. It Does work with the floor tool though.
Steps to reproduce:
1: Build with slab only
2: Erase with eraser tool
Expected result: erase pieces of slab
Actual result: Does not erase and leaves it whole
Note: The eraser too does work with reg floor tool
Note 2: The undo tool breaks here and there also
Edit: Workaround if anyone else has the problem. You can still use the slab too. but to erase, just highlight areas with the floor tool to replace then erase.