When a duplicant builds a tile at their feet, the next build's animation is borked

Kind of hard to explain this in the title.

Imagine that a dupe is building two adjacent floor tiles, while standing in the space that contains the one that he is building (there is a tile or rock or whatever under the floor tile). When that tile is built, the dupe will displace upward and will be standing on the tile he just built. He'll start building the adjacent tile. While he is building the adjacent tile, you can see the progress bar on the title but the dupe will be standing there like an idiot, rather than using his build-ray gun.

This is an animation bug. The tile gets built fine.