Repro steps:
1. Create a default new VFX asset and drag it onto the scene.
2. With the scene view open, move the bounds off-screen and back on-screen.
3. Observe that the system is not visible, even though its bounds are in view
4. Pan/rotate in the scene view
5. The system shows.

Expected outcome:
The system to become visible once its bounds are within view.

Note:
The same issue happens in Game View as well, but the camera needs to be moved away from the bounds and back where it can view them so the system would toggle active again.