Mobs Get Stuck On Snow Layers

Mobs of any kind have problems moving on Snow layers, making it possible to approach certain mobs that you would normally not be able to approach, with this bug I have been able to stand next to an Enderman and look him straight in the eye without him being able to attack me.

How to recreate: Journey to a Snow biome, wait for serveral weather cycles and Snow falls, then note how mobs become imobile or even float above invisible Snow Layers, have for instance a Creeper chase you, note that after a short while it will become stuck and unable to move.

Hopefully this is worded correctly and cannot in any way be misconstrued.