Dupes get trapped inside new tiles instead of landing on top like they used to

When duplicants build a tile on a spot that another dupe is standing on, the dupe used to pop up on an adjacent tile once the tile was completed, unless there was nowhere for them to land in which case the game threw an "entombed" notification.  Now the dupe just hangs out inside the new tile and can't move, but no error is thrown so if I hadn't been watching I'd never have known.