Added Flux Networks 1.16.5-6.1.6.11 to the latest release of the Enigmatica 6 modpack (minecraft version 1.16.5), and now am receiving mismatched mod list from multiple users. Triple checked the version number on both ends, even redownloaded the mod, still same behavior.

[Server] [User Authenticator #9/INFO] [minecraft/ServerLoginNetHandler]: UUID of player [user] is [uuid]
[Server] [Netty Epoll Server IO #44/ERROR] [ne.mi.fm.ne.NetworkRegistry/NETREGISTRY]: Channels [fluxnetworks:main_network] rejected their client side version number
[Server] [Netty Epoll Server IO #44/ERROR] [ne.mi.fm.ne.FMLHandshakeHandler/FMLHANDSHAKE]: Terminating connection with client, mismatched mod list

Server:

Client:

Closed, it should not happen in 6.2.0 (will release later).

so what the network version showed in the log? by finding Version test of