you are no longer able to grow 4 jungle sapplings into a large jungle tree when they are surrounded by snow as seen below. It also doesn't work under normal circumstances with a despencer instead of snow as seen below
I spammed it with 10.000 bonemeal and it stayed 4 sapplings.
what I expected to happen was:the sapplings would grow into a tree
what actually happened was: the sapplings stayed sapplings