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[ShaderGraph] Main Preview Window stops rendering graph's output when Sprite Master Node is connected to Multiplied Color Nodes

Package: Shader Graph


How to reproduce:
1. Open the attached project named "Case_1243468"
2. Open the Test shader graph
3. Observe that the Main preview window is functioning properly
4. Connect the Multiply Node to the Master's Color input
5. Observe the Main preview window again

Expected result: The main preview window continues to show the current graph's output
Actual result: The main preview does no longer render graph's output

Reproducible with: 2019.3.13f1, 2020.1.0b9, 2020.2.0a10
Could not test with: 2018.4.22f1 (2D renderer was not yet available)

Reproducible with package versions: 6.9.2, 7.3.1, 8.1.0, 9.0.0-preview.29(git master branch)

1. Shader graphs affected - Sprite Lit Graph, Sprite Unlit Graph

  1. Resolution Note:

    The Sprite master nodes use the Alpha channel on the color for the sprite alpha. Make sure your color input has an alpha value to resolve this.

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