[1.20.1] Mod have issues with packet sending?

[Fyoncle]

Bug description and reproduction steps

vgskye/e4mc-minecraft-architectury#48
See this.
You just add E4MC and music player & uteamcore in your modpack, then no one can join you that doesn't have these mods even tho music player client-sided

Log files and Screenshots

No need

Used minecraft version

1.20.x

Used forge or fabric version

0.16.5

Used mod version

2.7.0.292 / UTeamCore 5.1.4.312

[HyCraftHD]

Did you put uteamcore on the server?

[Fyoncle]

Did you put uteamcore on the server?

The issue i mentioned, it's from the mod E4MC, which lets you create a shareable ip adress in your singleplayer world.