So erasing parts of a roof and walls, suppose to take away sections and it does, but it still thinks it exist in the world even though you cant see it. Wont allow you to place block in the spot it use to be or paint underneath the area on blocks that are there under the erased ones.
Steps to reproduce:
Erase something on roof or wall, try and place a new voxel or paint a voxel under the erased voxel
can place a new voxel or paint
the voxel still exist yet not there, not allowing you to place a voxel or paint
only 1 workaround to this, place a voxel on the erased one, the extend it out form it then erase the voxels and then re-extended it back to cover the area, paint side you have to go underneath or trick the system in not showing all blocks