Crash when creating a Material Instance of a Material with Material Attribute Layers expression connected to a Substrate Convert Material Attributes.

A UDN user has reported this crash [Link Removed]

The user also reports that the editor will crash:

• If the material is loaded while in PIE.
• If the material is used in a level (crash occurs when the level is loaded).

• Create a Material (make sure Substrate is enabled in your project).
• Create a the graph as in the attached screenshot and save the material.
• Create a Material Instance, and select as Parent the created material.
• Save.

This will trigger a crash.