Upgrade in progress is cancelled when planned path is altered

This is reproducible. If you set a movement path for a unit that is actively upgrading and then a territory is captured by another player in the planned path then it causes the upgrade to be cancelled.

The unit begins moving along the path and would stop at the edge of the captured territory like normal. This forfeits any resources and manpower spent on the upgrade and it has to be restarted from scratch, paying the resource & manpower cost again.

Given the alteration to the path has nothing to do with the upgrade, the upgrade should not be cancelled.