Falling block switches quickly between entity and block when it fell on the shulker.
May cause some slight lag. No longer causing lag in 19w45a.
Falling sand does not land on shulker
Scaffolding switches quickly between entity and block when placed on some non-solid blocks
Falling blocks convert to blocks when falling on top of a boat
Falling blocks glitch through shulkers when the shulker is opening / closing
Falling blocks on top of non-full block without block below do not break