Copper golems colliding differently on paper.

When running a vannilla game I can push multiple copper golems into one corner as shown in this picture. However when I try this same thing on a paper server they push each other away, breaking the sorter design I am trying to build. I was wondering if I possibly missed something in the paper config to change this behavior and if not if there is any other way to achieve this.
Current collisions config:

collisions:
  allow-player-cramming-damage: false
  allow-vehicle-collisions: true
  fix-climbing-bypassing-cramming-rule: false
  max-entity-collisions: 8
  only-players-collide: false