Note: If your arenas are not loading (or you are getting chunk errors), 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 (/splegg 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.
Per request, a hologram plugin is no longer required for the plugin to start.
If this case, powerups will no longer have holograms
If you want to update to 1.21 and still want holograms wait for DecentHolograms 1.21 update.
Fixed ActionBar not working in some versions.
Testing some other small performance improvements.