I participated on a game jam last weekend and made a DK barrel clone with spaceships.
So, basically the game is throwing yourself from planet to planet using a “Set physics linear velocity” in the direction of an arrow (and arrow pivot for aesthetics). This is the setup worked smoothly in preview mode, also I tested with Print Strings for the forward vector of the arrow, it always returned the right direction.
I have the same issue. I am using Linux and the published build just returns 0 for all the Get Forward Vector and Get Right Vector functions. It seems to be a bug in Unreal Engine.
Do you mind to share how you solved this issue exactly? I need to get the forward and right side of a camera actor / camera component, and there is no “Pivot Up Vector” on it, only a Pivot Offset.