Traps can merge with previously built buildings

Steps to reproduce:

  1. Build a building.
  2. Add traps to completed building.
  3. Notice some can’t be removed.

Expected Results:
Non-building parts remain independent.

Actual Results:

The critter traps on the bridge.

Game save here

Version Number and Mods in use:
release-701 (x64). No Mods.

It is the same with almost every moveable/placeable item.