Blueprint books being cleared

[KiwiHawk]

Bug: Upgrade planner is clearing blueprint books, upgrade planners, and deconstruction planners

Steps to reproduce:

1. Start a new game
2. Place stone furnace
3. Create an upgrade planner
4. Customize the planner (e.g. give it a name)
5. Hold down Ctrl while dragging the planner over the furnace
6. Result: planner will be cleared
7. Expected result: planner is unchanged

This can be a serious issue, causing people to loose blueprint books. I'm the dev for Sea Block and someone reported this issue on our discord. They had a deconstruction planner in their blueprint book an they lost all their blueprints. They weren't intending to use Even Distribution's functionality at the time.

2022-03-28_21-35-11.mp4