Steps to reproduce

1. Connect to 1.12.2 server
2. Open crafting table
3. Shift click an item in your inventory
4. It happens client side but server doesn't know what to do

Expected behaviour
A polyfill to make it work like in 1.17.1 or just block the feature to prevent anti cheat detection

same thing with pressing f in your inventory on 1.9-1.12.2 (not sure when the shortcut was added) it only happens client side