If you pile up snow to 8 blocks high it does not behave like snow blocks (even though identical). Blocks can not be placed on them (Not even a redstone torch) and if the block below them is removed then it will also disappear.
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This issue reports 2 problems.
One is that player cannot place redstone torch on 8-layered snow.
Another is dupe of MC-8797.
Duplicate of MC-8797.