When using either type of Sifter on a server, it will appear to be working normally. However, for some reason the random number generator outputs a different item result to the client than it does to the server every time you sift something, so while it may, for example, look like you got a Technological Doodad from a block of Rubble, attempting to pull the item out of your inventory will cause the inventory to update, revealing that you actually got a completely different item on the server.
The process is most obvious when sifting large quantities of blocks. Sifting a bunch of stuff and then pulling one item out of your inventory will cause all of the items to update, completely changing what items appear.
When using either type of Sifter on a server, it will appear to be working normally. However, for some reason the random number generator outputs a different item result to the client than it does to the server every time you sift something, so while it may, for example, look like you got a Technological Doodad from a block of Rubble, attempting to pull the item out of your inventory will cause the inventory to update, revealing that you actually got a completely different item on the server.
The process is most obvious when sifting large quantities of blocks. Sifting a bunch of stuff and then pulling one item out of your inventory will cause all of the items to update, completely changing what items appear.