How to reproduce:
# Open the attached package
# Open Mesh Output VFX
# Open Shader Object Picker
# Notice that VFX are in the search results
# Assign any vfx to teh shader graph field

Expected result: VFXs are not listed in the search, and shader depenedencies cannot be assigned

Actual result: Errors are thrown to the console, VFXs are listed and can be assigned to the field

Not reproducible with: 2021.3.11f1

Error message: [Worker39] Shader error in 'Hidden/VFX/LitOutputs - Simple Lit Translucent - Cookie/System (1)/Output Particle HDRP Lit Cube': unrecognized identifier 'OUTPUT_GBUFFER' at line 2560 (on d3d11)

Scenario: sometimes it catches SG and then assigns that shader to several mesh outputs