This is quite a silly bug I experienced. While in the old Silithus map, around the 38, 75 coordinate there’s a specific area where, if going north, the world changes automatically to the actual (“The Wound”) version. Getting out of that area goes back to the old version.
Here I’m at that specific point: https://imgur.com/hCwupJ2
And if I move north a little bit, bam! https://imgur.com/Xs3gAYw