Spatial Ruptures doesnt have to be a Black Hole; If you say that a Nebula imploded, It can be making a star.
If you say that a Star Imploded, it's a black hole.
If you say that a Black Hole imploded, You can say that it's a Dense Singularity (even though if such things existed it would be hell for the galaxy) or a White hole
Or why don't you say that the Time-space fabric collapsed?
Make it so that whatever ship goes to the center, make it transport the ship randomly throughout the quadrant?
Just Some ideas.