[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

[Rseding91]

Thanks for the report. Due to the way rails are programed, they currently do not and have never supported upgrading with robots. The only way to "upgrade" them is to remove them and re-build with a different quality. One possible option is we stick the "not upgradable" flag on them, or simply leave them as is.