Lerp and / or Add torque in degrees doesn't seem to be working

Hi all,

So I’ve got some “deceleration” logic to make things slowly come to a stop when you stop pressing a button. It works perfectly in simulation mode in UE editor. But it doesn’t seem to work AT ALL when the game is packaged / built. Anyone know why this might be?

Here’s the logic:

It is being called thusly: