Hi :) I know this isn't an issue but I hope we get an official 1.20 update for this plugin. It's incredibly useful!

This is likely because you are using bukkit. Bukkit doesn't have the proper API to send messages to the actionbar. So, for those users, I have to use NMS and update it everytime minecraft updates. I haven't gotten to that yet.

In the meantime, the plugin will work on 1.20 (and future versions) if you run your server on spigot or paper instead of bukkit.

Fixed b6beb18