Dupe trapped in empty space deconstructing transit tube

I queued up a deconstruct order on a Transit Tube Access and it's Transit Tubes.

Duplicant seemed to deconstruct the transit tube segment above the access while using the access at the same time.  Result is that they are stuck in empty space in the tile where the transit tube connected to the access.  Reloading has not helped.

Workaround (after it happened again, but while one dupe deconstructed a transit tube segment with another dupe in it) is to rebuild the transit tube segment - the dupe then falls out of it an escapes.