TetraNetFix
In large modpacks, there are sometimes issues with Tetra's network communication that cause items to become invisible. This mod fixes this error, but requires installation on both the server and client.
From a technical perspective, the problem is related to a mismatch between client and server packet IDs caused by loading order peculiarities. As a result, the client cannot correctly process data sent by the server. The TetraNetFix mod forcibly establishes the correct packet processing sequence immediately after initializing the network message handler.