Why does my Minecraft modpack work in single-player but fail with “Failed to synchronize registry data” when joining a server?

Question

I created a custom Minecraft Java Edition modpack using NeoForge. It launches correctly in single-player, but joining my dedicated server immediately returns this error: Failed to synchronize registry data from server Connection closed - mismatched mod channel list Both the client and server use the same Minecraft and NeoForge versions. I also copied the same mods folder to both installations.

Why does my Minecraft modpack work in single-player but fail with “Failed to synchronize registry data” when joining a server?

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