Repro steps:

1. Import the attached project and open the Repro scene
2. Hide the Game View
3. In the Scene view, zoom in and out from the effect
4. Observe that all particles do not turn red
5. Open the VFX and enable the Collide with Depth Buffer block in Update
6. Repeat step 3 and observe that the particles now go from green to red when the Scene camera is far

Expected outcome:
- The Game/Scene camera fallback to work with all MainCamera operator outputs, even if camera buffers are not used.