Briefly, porting /home from mining works fine. Attempting to use /back to go back to mining from the main world gives:

"Error: You do not have the essentials.world.mining permission."

Presumably I have some sort of permission, as I can go through the portal ;)

Yes, it's repeatable.

 

Huh, could have sworn it did yesterday. Maybe I just went one way and assumed it did. Thanks, anyhow.