Sulfur Cube with given block takes entity cramming damage

Thank you for helping us improve Minecraft! We saved your files:

Supplement of the full bug description (The original description is not visible due to font color issue, here is the complete content):
Short description of the issue
A Sulfur Cube that has been given a block is supposed to be invulnerable to all damage except void damage and /kill command damage, but it still takes entity cramming damage when crowded together.
Steps to reproduce the issue
1.Give a block to a Sulfur Cube.
2.Catch it in a bucket.
3.Right click repeatedly to place many of them in the same area.
4.Observe the Sulfur Cubes' status.
Expected result
The Sulfur Cubes with given blocks should not take any entity cramming damage and should survive.
Actual result
The Sulfur Cubes with given blocks take entity cramming damage and die when crowded together.