Bypass allowing to bring out items

[Lerbiq]

Plugin version: 2.5.2
Server: 1.16.5 Paper-794 and Paper-408 1.17.1
Other plugins: None

Using a hack client/utility client to spoof your client sided gamemode and using xcarry allows you to bring out item from creative. This also works with anticheat that prevent xcarry (easier actually).

How to reproduce:
1. Go into creative
2. Turn on xcarry (module that allows you to store items in your crafting slots)
3. Spoof your client sided gamemode to survival (.gamemode survival in most clients)
4. Place the items you want to bring to survival (If xcarry is patched by the anticheat, the items would drop out onto the ground at this point)
5. Switch to survival using /survival
6. Take the items out from the crafting slots