Unreal Engine Issues and Bug Tracker (UE-63632)

Steps to Reproduce

Reproduce Steps:

Create a Postprocess material;
Copy and paste the text attached into the material, Connect output of Custom node to Emissive input of the Material; Compile and save
Assign the material to a Postprocess volume and get it work in viewport
See it works as expected in SM5 preview mode;
Enable Mobile preview mode, it stop working

It does work on Mobile Preview mode in 4.19 and 4.18

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Non-Issue

Custom node with SceneTextureLookup function doesn't support on Mobile anymore