Saver node issue in Fusion page

I am having a problem with a saver node in the Fusion page of Resolve 15. I am not getting the result as expected, as shown in the viewer.

The setup. 1920x1080p29.97 timeline. Solid color generator clip (white) on edit timeline. Converted to a fusion clip. In fusion drop the smokestack particle sim template into the comp. Connect media-in and out as shown to the particle template.

The saver is attached to the output of the brightness/contrast node. I am trying to save the texture used in the particle sim.

I am not getting the result of the bright/contrast node. I am getting the result of fast noise. The viewer of the saver node is correct/expected and is the same as viewing bright/contrast, but the actual saved output is like the fast noise node.

Screenshot of saver viewer.


Screenshot of bright/contrast viewer


Screenshot of fast noise viewer.


I DL'd Fusion 9.0.2 "proper" and I get the same results there.

So I don't understand something or something is borked. Any ideas?