Minecraft name: JJ_Falcon

Problem: I'm having trouble with the bigger on the inside feature. When I look into the door's of any tardis not just my own all I see is void. I'm using update 56 of the dalek mod and JEI. my version of forge is, 1.12.2-forge1.12.2-14.23.5.2847. Is this version not compatible with the feature?

Screenshot: 

This feature is disabled on DMU Public for lag reasons, which is why you see a black void. It is however, enabled on DMU Beta.

It Shows void for me too even though i'm in a private world.

P.S. i'm in update 57

You have to enable it via the config.

There's two options you have to turn on, one in Client Side and one in Tardis
"Render BOTI Portal" should be True and "Toggle BOTI - SOTO" should also be True.