When using ammo, and physics objects are removed, the collision event does not work properly anymore. There are dropouts in between.

If Ammo.destroy(this.body); is replaced by this.system.driver.removeBody(this.body); it works. with remove: element in line 16560

here is the whole element from line 16560:
remove: function() {
if (this.triMesh) Ammo.destroy(this.triMesh);
if (this.localScaling) Ammo.destroy(this.localScaling);
if (this.compoundShape) Ammo.destroy(this.compoundShape);
if (this.body) {
// Ammo.destroy(this.body);
this.system.driver.removeBody(this.body)
delete this.body;
}
Ammo.destroy(this.rbInfo);
Ammo.destroy(this.msTransform);
Ammo.destroy(this.motionState);
Ammo.destroy(this.localInertia);
Ammo.destroy(this.rotation);
},

For example it works, remove the ammo body and the object3D separate, not problem

document.querySelector('a-scene').systems.physics.driver.removeBody(e.target.body)
e.target.object3D.parent.remove(e.target.object3D)

i have reported this before here:
n5ro#137 (comment)

here is a new glitch to see the error:
(Comment out the new script 'aframe-physic-system-fix.js'
aframe-physic-system.js is the original.
perhaps increase the number and speed of boxes on powerful computers to see the error)
https://aframe-physics-system-remove-bug.glitch.me