So this happened when I went into my private pocket:
https://paste.dimdev.org/inozucesix.rb
This is the full log:
https://gist.github.com/Trinsdar/0661a0e2028237c0acc16b2d1254826c
it threw an error and teleported me to another private pocket. then if I try to leave it it sends me to limbo saying I didn't go through a rift.
the private pocket it teleported me too was only about 500 blacks away from my private pocket.

Private pocket keeps resetting upon reentry on version 3.0.11 for MC 1.12.2
Not creating a new pocket, but actually regenerating - always at 0 20 0
Log says it's missing the "PocketRegistryNBTWriter", could that be caused by another mod?
Log: https://gist.github.com/danlizard/d0ccb97482e798f9bda78a362d2d26b1
Interesting observation: items dropped in the dimension stay there, unlike the blocks.

Dimdoors version [email protected]+287

I would say that this a duplicate of #64 , however...
This seems to be caused by an entry being removed from, or not correctly saved to the Rift Registry.