Destroying Rigidbody2D of an object while it is colliding crashes Unity.

Steps to reproduce:
1) Open the attached project.
2) Open 'Test' scene.
3) Enter play mode.
- As soon as the the two squares in the scene touch, Unity will most likely crash, if it doesn't, wait for a few seconds, or:
4) Click on the BottomSquare object in the Hierarchy.

The scene consists of two 2D squares. The bottom one is Kinematic (can be Dynamic and constrained instead, doesn't matter) ant the top one is dynamic. When the scene is played, the top square falls on the bottom one. When they touch, Destroy() method is called on bottom square's Rigidbody2D. This results in a crash in Rigidbody2D::IsSleeping()

Reproduced on:
5.6.0b3, 5.6.0b1, 5.6.0a6, 5.6.0a4

Did not reproduce:
5.6.0a3, 5.5.0p3, 5.4.4f1, 5.3.7p3, 5.2.4f1