Every tick, a snowman attempts to generate snow.

This is both on the server, and on the client.
Its not needed on the client as the server sends the block change already.

Namely, every single tick, the minecraft client turns all the viable air to snow. Every single tick on the minecraft server, it turns the viable blocks to snow, and sends the client the snow updates.

This would normally not be a large issue, except sometimes the snow generated by the client might not be reflected by the server and result in the client viewing snow blocks on the ground which are client sided only.

Resulting in fake snow blocks.

The simple fix for this is to remove the code for generating snow from the client. It would not only fix this bug, but would give a tiny negligible performance boost.