- Create a parent project called "Crab" in Space 1.
- Create a milestone called "Left Claw".
- Shift "Crab" to Space 2.
- Create a milestone called "Right Claw".
...you currently end up with "Left Claw" in the wrong spacePHID in the database. At the application level it's in the correct space, but when we WHERE ... AND spacePHID IN (...) we can incorrectly filter it out.