Why do VFX particles change velocity depending on the systems rotation when simulating in world space?

Hello, thank you for checking out my question!

I created a particle system in VFX graph that sends out particles in a straight line. When the emitter moves, I want the particles to continue with their own momentum, which is why i set the simulation to world space (top right corner of any graph block). This works. As long as the system is rotated 90 degrees in an direction, the stream of particles continues as set up in the node graph. Below you can see the system rotated -90° in the X axis. But when the emitter is rotated 45 degrees in any direction, particle movement directions begin to spread out, specifically in world Y (up/down) direction. It is a smooth transition from the straight line to a cone. Below you can see the system rotated 45° around the X axis.

This only happens when the VFX graph is set to world space and the spread along the world Y axis is persistent, no matter around which axis I rotate the system.

If anyone knows a solution to this problem I would be very grateful.