when a gravel block falls into the block where the base of the ender crystal is it will not drop like it should seeing as it is a transparent block and a block cannot be placed into the same space as it.This is seen in the screenshot below.
MC-7948
Gravel should break
Resolved
Works As Intended
0
The bedrock slab ring around the bedrock is part of the Ender Crystal entity.
Entities can ocupy same spaces as blocks. More information can be found here.