Bug in logic porting System to Behavior

I have a simple physics update for my system

Code (JavaScript):

1. this.world.forEach([game.MovementData, ut.Core2D.TransformLocalPosition, ut.Core2D.TransformLocalRotation],(player, position, rotation)=>
2.                 {
3.                     let deltaTime = this.scheduler.deltaTime();
4.      
5.                     if(!this.intialized )
6.                     {
7.                         this.Initalize();
8.                     }
9.                  
10.                     let originalPosition = position.position;
11.  
12.                     rotation.rotation = this.UpdateRotation(deltaTime, rotation.rotation);
13.  
14.                    position.position = this.UpdatePositon(deltaTime,player, position.position, rotation.rotation);
15.    
16.                    //update Velocity
17.                    player.currentVelocity = game.PhysicsUtilites.VelocityVector(deltaTime,originalPosition, position.position);
18.                 });

Nothing fancy but note the orginialPosition is set by the position.position.

If I use the same logic in a behavior

Code (JavaScript):

1.         OnEntityUpdate():void
2.         {
3.                 let rotation = this.data.rotation;
4.                 let position = this.data.position;
5.                 let player = this.data.player;
6.  
7.                 let deltaTime = this.scheduler.deltaTime();
8.  
9.                 let originalPosition = position.position;
10.  
11.                 rotation.rotation = this.UpdateRotation(deltaTime, rotation.rotation);
12.  
13.                
14.                position.position = this.UpdatePositon(deltaTime,player, position.position, rotation.rotation);
15.  
16.                //update Velocity
17.                this.data.player.currentVelocity = game.PhysicsUtilites.VelocityVector(deltaTime,originalPosition, position.position);
18.         }

The velocity is never updated because it originalPosition takes the values of position.position . . . after it was set. . .ie it is a reference.

BUT if I do this

Code (JavaScript):

1.  
2. OnEntityUpdate():void
3. {
4. let rotation = this.data.rotation;
5. let position = this.data.position;
6. let player = this.data.player;
7.  
8. let deltaTime = this.scheduler.deltaTime();
9.  
10. let originalPosition = new Vector3(position.position.x,position.position.y,position.position.z) ;
11.  
12. rotation.rotation = this.UpdateRotation(deltaTime, rotation.rotation);
13.  
14. position.position = this.UpdatePositon(deltaTime,player, position.position, rotation.rotation);
15.  
16. //update Velocity
17. this.data.player.currentVelocity = game.PhysicsUtilites.VelocityVector(deltaTime,originalPosition, position.position);
18.  
19. }
20.  

Creating a new Vector3, initialized with the values of position.position I get my expected behavior.