The docs say:
“If you have a sleeping rigidbody and you move a static collider (A collider without a Rigidbody attached) into the rigidbody or pull it from underneath the rigidbody, the sleeping rigidbody will not awake”
I tested this with two cubes. One with a rigidbody and the other with just a box collider. After leaving the rigidbody for a while after it landed on the box collider cube, I presumed it would be asleep and removed the cube from underneath. But the rigid body just continued to fall. I have played around with the physics settings but still nothing has changed the outcome.
Is this a bug?