really not much more to it than that, seems like its just completely not implemented (if its even possible to)
returning to native chat by rolling back to the live version or just disabling 7tv entirely lets it function. don't know if this is issue is fixable on the 7tv end of things or if the extension itself would need to be changed but still worth mentioning
https://chrome.google.com/webstore/detail/twitch-chat-pronouns/agnfbjmjkdncblnkpkgoefbpogemfcii (enabling on ffz instead of standalone doesn't work either)