Repro steps:
1. Open the attached VFX
2. Enable Runtime Mode (Forced)
3. Observe that the effect doesn't render and console errors are shown

Note:
- Affected maps are Mask, Normal, and Emissive. Assigning a texture any of them fixes the issue, except for emissive.
- Emissive seems to throw the error and fail compilation, regardless of whether it has a texture assigned or not
- The Mask map slots throws errors usually if it's on its own (i.e. without Normal or Emissive present).
- Not a regression, repros in 6.9.2