Putting Spruce Logs in any other slot besides the top left does not reduce the log count. I learned this whilst playing Realms, with my friend.

Steps to reproduce:

Get any number of spruce logs, and craft Spruce planks with any other slot then the top left in the 2x2 crafting grid.

Expected results:

The amount of logs would reduce.

Observed results:

The amount of logs does not reduce, allowing duplicating without cheats, mods, or otherwise.