[2.0.31] Construction bots fail to upgrade to legendary rail

[sectoidfodder]

What did you do?
Use an upgrade planner to upgrade rail to legendary rail, or
Place a blueprint with legendary rail over existing rail


What happened?
Construction Robot picks up legendary rail, flies to target, does nothing at the target, returns with legendary rail and drops it into a storage chest

What did you expect to happen instead? It might be obvious to you, but do it anyway!
Robot should place legendary rail and pick up normal rail before returning

Does it happen always, once, or sometimes?
Always

Can reproduce in provided save - remote view Nauvis and use either the blueprint or upgrade planner in quickbar #4 over existing normal rails