Rigidbody2D just isn't updating

Unity Engine
1

I am utterly stumped on this one.
For some reason, a particular enemy type in my game will not update its velocity.

My code simply declares “rBody.velocity = newVelocity;” and I’ve verified through debug.log that the newVelocity is properly updating its value on each update. And clearly it is finding the rigidbody because there are no null reference errors popping up in my log. This is the last thing in my update function, and when I add debug.logs after it they get called, so I know this command is being received.

But this enemy just floats in the air where it was spawned. And when I look at it in the inspector, the “info” listed in the Rigidbody2D continues to show the velocity as 0,0.

I cannot find anything in my scripts that could account for this behavior. What am I missing? Is there some setting I must have neglected to check?
I don’t have problems with my other enemies nor my player, just this one enemy type.

It used to be working fine with my original version I had made many years ago in Unity 4. This is a problem I’ve run into after porting my game to the latest version of Unity. But I can’t find any setting that got screwed up in the conversion, and as I said, the other characters in my scene are working just fine.

I’m at my wits end. Anyone have any thoughts of what I need to check?

2

UPDATE:
I’ve found that my rigidbody’s velocity IS indeed being set to its correct value at the end of each update.
However, when I get to the very next update it has been set to 0. With this in mind, there is clearly nothing in my code that could be setting my velocity back to zero; it’s some setting in the physics for this enemy.

3

A collision response is the only case where the velocity will be changed by the physics system so are there any contacts on it (those show in the inspector)? Do you perhaps have XY constraints on?

4

The contacts list is blank, and the freeze positions are not checked.

I wound up just creating another copy and it doesn’t have any problems.
I can’t find any differences in the settings between these two. But one prefab works, and the other doesn’t.

5

That is bizarre indeed.