Using "start previewing node" in a post process material does not work. The preview will only show the final result that is connected to the material attributes. 

Working as expected in 4.18 CL# 3832480

Found in 4.19 CL# 4033788, 4.20 CL# 4369336, 4.21 CL# 4408769

This is a regression.

Steps to Reproduce
  1. Open the editor
  2. Create a new material
  3. Set its Domain to Post Process
  4. Place a "Constant 3Vector" node and set R to 1
  5. Right click the node and select "Start Previewing Node"

The preview will stay black

The preview would show red like the "Constant 3Vector" is set

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Affects Versions4.194.204.21
CreatedOct 1, 2018
ResolvedJan 7, 2019
UpdatedJan 15, 2019