I got the player character to be able to shrink and grow a spline mesh along a spline however the collision doesn’t update with the model during PIE. I’m setting the mesh’s end point to change the size.
Use SplineMeshComponent with Spline (Don’t create SplineMeshComponent separately from Spline). Then create and modify Spline Mesh in code. In code in runtime, the dynamic update of SplineMesh collision works fine.