Steps:
- Give train simple order list (in my example, go to a single station and wait 30 seconds of inactivity).
- Place first temporary train stop, and allow train to begin navigating to its new temporary destination.
- Place second temporary stop.
- Drag second stop above the first stop, do not make it active.
- Attempt to set new waiting conditions to the "second" (which is now above the first) temporary stop.
- The "first" stops orders will be changed.