Possible ID problem starting from 32767 items on Servers

[Spancoe]

Possible ID problem starting from 32767 items on servers, I have tried with various mods, mixed modpacks, and checked the item IDs with JEI to see if the same issue occurred, and it did. The server is using the latest version of Forge 1.12.2. When searching for the hard limit of version 1.12.2, I found that "Minecraft actually allows item IDs up to 32767," I don't have any issues in singleplayer, the problem only occurs with Forge servers. Could it be a Forge limitation? If so, is there a way to overcome it?

In a private conversation on Discord, I was told... To summarize, it's the same as what i searched earlier.
"In Minecraft, each item and block has a unique identifier known as an ID. In older versions of Minecraft, including 1.12.2, the ID limit for items and blocks was 32767. This means that you cannot have more than 32767 distinct items or blocks in the game. This limitation exists due to technical constraints within Minecraft itself."

Logs only shows "Disconnected" or "Timed Out"