To recreate the bug, do the following steps:
1) Create a new scene and an actor
2) Create an actor behavior
3) Include the steps in my example photo: Set x:100, Set y:100, Spin 360, slide to x/y:300/300. The durations don't matter.
4) Place the actor in the scene somewhere off to the right (x:300, y:100)
5) Run the game
What should happen: The actor's position is moved to 100/100 and then begins a spin/slide to 300/300.
What actually happens: The actor remains in it's default position 300/100 and then begins a spin/slide to 300/300. The X/Y set to 100/100 is ignored.