Note: If your arenas are not loading, you'll need to update your game worlds.
Start the server with the --forceUpgrade argument line
Let everything load, it will take a while
Finish each of your arenas again (/dragons finish <arena>), this will erase the world arena from the maps folder and copy the current new loaded and updated ones.
This will be very resource heavy, recommend doing with the server on maintenance.
After that, you can remove the --forceUpgrade line.
Fixed ActionBar loading incorrectly in some versions.