Constraining aspect ratio of cine camera with post process material attached causes rendering issue

Applying a PP material that uses absolute world position to a cine camera using "constrain aspect ratio" causes rendering issue.

Note: Changing the film back settings on the camera also results in the same behavior

Tested in: 4.22.3 CL#7053642 4.23 CL#9631420, 4.25 CL#10387577

Attached a repro project, open "test" level. 

1. Open the UE4 Editor and create a Blank Project.
2. Put a CineCamera in Level
3. Set the camera in "Set View Target with Blend" inside the Level BP
4. Create Material asset and set it 's "Material Domain" property to "Post Process"
5. Make some post process with using "Absolute World Position" node. 
6. Set the Material to the CineCamera's "Post Process Material"
7. Set CineCamera's Camera options to Constrain Aspect Ratio (if not already set)
8. Play
9. Grab the viewport window and stretch/shrink left and right.

The viewport has severe rendering issues when constrain aspect ratio is applied and a post process material is affecting the scene set to "After Tonemapping" in it's blendable location