Shulker cannot correctly spawn to the block(The side/below) by use spawn egg

This issue is caused by fixes MC-106168.

It looks like all mobs are spawned one block below the position where you expect them to spawn when using a spawn egg on the side of a block. This might make sense for mobs that are larger than one block, but for the other ones that are smaller like Shulkers or Chickens it is kind of strange.

The code assumed it was spawned above solids and tried to find the right spot, now if it has no colliders it assumes the feet should be where they started.