How Pocket Dimensions Work:
After you enter a rift (A new block included in the update), you get teleported into a sandbox-sized map that is in the same server as you were in before. (When you get warped into the pocket dimension, the original map gets off-loaded)
Pocket dimensions have block limits of 3000, and cannot have rifts in them other than the one that connects back to the main map. You can have a max of three pocket dimensions in one map.
Wireless senders/receivers and variables can communicate through dimensions by default, to hide wiring and leave space for detail in maps; however, you can disable this in the advanced options menu.
You can also set a limit on how many players can be in a pocket dimension at a time, and they are team based. (If there is a team the same color as a rift, only that team can go inside)
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This suggestion may be confusing, so please let me know if there is any confusion I can clear. Please, feel free to suggest anything I can add as well.
Hope you like my suggestion, have a great day!

