This is still happening in 1.5.2 full release. Any and all animals which have a smaller hit box when they are babies than when they are adults, will begin to take suffocation damage when they grow, if they are next to a block. This is because when they grow, their hit boxes embiggen, taking space inside the solid block. The animal will become stuck and invariably die. This will happen in ANY sized pen, not necessarily 1x1 boxes. Because the baby animal simply needs to be standing next to any block at the point of growth.
This is still happening in 1.5.2 full release.
Any and all animals which have a smaller hit box when they are babies than when they are adults, will begin to take suffocation damage when they grow, if they are next to a block.
This is because when they grow, their hit boxes embiggen, taking space inside the solid block.
The animal will become stuck and invariably die.
This will happen in ANY sized pen, not necessarily 1x1 boxes. Because the baby animal simply needs to be standing next to any block at the point of growth.