I have cloned and made a minor modification inside Main.java player.sendMessage(ForgeHooks.newChatWithLinks("You are now chatting with an AI"), (UUID)null); ...
The patch notes for version 5.0.0.6 say "Fix Jankson being shadowed to the wrong package in Fabric", but it appears to also be shaded to the wrong package in NeoForge. Here is a screenshot of the ...