I recently upgraded Mastodon to the latest version v4.1.0 (https://social.nextgamers.eu).
Also I upgraded PaperMC (our Minecraft Server Software) to the latest dev versions. Available updates for plugins were also put into place. All plugins are up-to-date ;).
For your info, starting with Minecraft 1.20 we will always run two overworld maps. One with your old buildings, and one with the new versions generator to have latest things available everywhere on the map.
Have fun! 🙂