Hi, im using the newest version of dimdoors beta.3-26.07.2021
and attempting to walk into a wooden dimension door or a random rift in the wilderness causes it to request the issue be reported.
here is the code if you can get anything from it: https://pastebin.com/NyZrw5ar

b604e71 fixes at least half of this issue.
Feel free to close the issue if this fixes it for you.

For devs:
It may still occur if a chunk that would contain a pockets rift is loaded during pocket creation. This is a guesstimate though, might just already be fixed now.
See PocketGeneratorReference#prepareAndPlacePocket.