When I was placing snow on top of snow (in one-single-layer-of-snow biome) to stack them, they seem to be normal at first.
But just after I added the last layer of snow so that they become a single snow block, the bock that I just created disappeared immediately and only the layer that was generated by the game remained. I repeated the process and the same happened (not just on the same block, but on many other blocks around it, and I am in taiga biome so it couldn't have melted.).
just to give you the seed and the coordinates I did this:
seed: -3136499337269787360
coordinates: -309 63 209
This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded Minecraft.