How to reproduce:
1. Open the attached project "Multi select"
2. Open the "11. HBAO" scene
3. In the Hierarchy's search bar type in "Crab_body" and select all of the objects
4. Observe the Scene View's poor performance

Expected result: reorderable arrays do not slow down the scene view
Actual result: selecting objects that have the reorderable arrays in its inspectors slows down the scene view drastically

Reproduced in: 2021.2.0a6, 2021.2.0a5
Not reproducible in: 2021.2.0a4, 2021.1.0b8