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Changelog
Updated the addon to work for the newest version of the game, you no longer need to enable expirements
Added a new gamerule, called "allowCrossing". When set to true will allow players to cross without teleporting them back.


Would it be possible to make the world borders apply to the Nether and End dimensions as well?
Hopefully it should work for you now, just download the addon labeled "fix".
If I could get some information on what you're struggling with, that would be nice.