Hello,
The plugin has been tested on each of the given versions and it works flawlessly. The teleport location MUST be changed by the administrator, otherwise in the nether and end world it will teleport to coordinates: 0x 100y 0z. Overwold coordinates are set by default as the server's natural spawn. Changing the location of the teleport can be determined using the /location command or by changing the data in the locations.yml file.

Please check what errors you see in the console and I invite you to the discussion channel so I can help you.

Hey, thanks for the rating.
If you use the "teleport" option after falling into the void, try to set the teleportation point one block above the ground (you can change the teleportation location with the command /location). Standard coordinates are the natural spawn in a given world.
However, if you use the "up" option, it is not suitable for lobby servers. Check your plugin configuration.

I'm glad and thanks for the review