Duplicant stuck on party line phone

Hello

When I recently continue my game after a pause, I sometimes got a duplicant stuck on a party line phone.

It not occurs each cycle, but very often. Only one duplicant is implied. And always in the same base.

As far I know, the only thing that differs from other bases for this recreation room is that this zone was exposed to space.

Very weird

Forcing move unstuck the duplicant... until another or the same get stuck later ...