Steps to reproduce:
- Load the attached save
- Try to place a pipe at the output of the pumpjack next to the character. It fails (correctly) with the reason "Tree is in the way"
- Place a ghost pipe in the same location. Ghost placement succeeds but the offending tree is not marked for deconstruction (this is the bug).
- If you try to place a normal pipe again it still fails because "Tree is in the way".