Question Unity 2021 iOS Metal Hang with Mobile/Diffuse shaders

We are upgrading our game from Unity 2019.4.36f1 to 2021.3.11f1. In new iOS builds of 2021, we are facing the following hang with metal API,

This is when assigning material with Mobile/Diffuse from an asset bundle built with Unity 2019.4.3f1 in runtime. Please help us with a resolution as we are blocked on the release pipeline with this.

Code (CSharp):

1. -[MTLDebugRenderCommandEncoder validateCommonDrawErrors:]:5252: failed assertion `Draw Errors Validation
2.  
3. Fragment Function(xlatMtlMain): missing buffer binding at index 0 for FGlobals[0].
4.  
5. dyld4 config: DYLD_INSERT_LIBRARIES=/Developer/usr/lib/libMainThreadChecker.dylib:/Developer/Library/PrivateFrameworks/DTDDISupport.framework/libViewDebuggerSupport.dylib
6.  
7. -[MTLDebugRenderCommandEncoder validateCommonDrawErrors:]:5252: failed assertion `Draw Errors Validation
8.  
9. Fragment Function(xlatMtlMain): missing buffer binding at index 0 for FGlobals[0].

 

I was able to narrow down the issue to the fact I had Unlit shader graphs. Fixed by converting them to Lit, but still curious if there's a way to do Metal validation inside Unity to catch these issues earlier.

There's an

enableMetalAPIValidation

flag you can set on

UnityEditor.PlayerSettings

but that doesn't seem to do anything.