They were not removed. Using the current experimental, I also set up a vanilla debug world. No mods, just DDA.
The refugee center still exists, it just often spawns very VERY far away. You can pick up a quest to go to the refugee center by interacting with the computer in the evac shelter.
When you open the map, and that quest is selected, there’s a (VERY small) red > at the edge of your screen. This points in the direction of the refugee center. It will also say ‘Distance to target:’ in the upper right corner explaining how far you are from the center.
In my vanilla debug, it spawned right near the evac shelter, which is something I’ve never seen before. It’s usually very far away.