That is technically a workaround, as all that does it change which formatter you are using, which is only for select Unity games and only works because it's filtered natively in Rust chat so it isn't handled by Better Chat.codepimp1234this is a simple fix....someone needs to make the change other than Death because well....
Change this:
string newText = $"@[{highlightColour}]{highlightText}[/#]";
TO THIS:
string newText = $"@<color={highlightColour}>{highlightText}</color>";
An actual fix would need to be made in Better Chat.