Grass plank storage (large and normal) will not fit on one grid tile. Snap to grid won't allow things to be placed in spaces that could be placed in the same spot without snap enabled. Some structures float when the support connecting it to the ground is broken.

Noticed something else: Snap to grid will say that a build is unsupported when it is on the ground (Grass floor) there are tiles surrounding it on all sides but it won't let me place the structure.