Anything with Subtract blending mode appears black in rescaled output

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

30.1.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/h2Ilp5Wf1bzNCqlK

OBS Studio Crash Log URL

No response

Expected Behavior

The video output should match the visuals in the program view.

Current Behavior

When rescaling output to stream or recording, any area of the output where the layer with Subtract blending is unobstructed appears solid black.

Demonstration

Steps to Reproduce

1. Create a background image layer.
2. Create a foreground image layer and set its blending to Subtract.
3. Place a third semitransparent layer on top.
4. Go to recording output settings and enable rescale output.
5. Record the scene and look at the output file.

Anything else we should know?

The issue can be fixed by placing a solid black image over the entire screen and setting it to Additive blending.
This is a half educated guess, but I think this may involve the rescaler taking alpha values into account? This issue only occurs with Subtract blending specifically and outputs correctly to the Program view, any unscaled outputs, and behind any semitransparent layers.

Start with the provided OBS log and reproduce the issue using the listed scene setup and recording rescale steps on Windows 11. Compare the Program view with the recorded output, focusing on areas using Subtract blending. Done means rescaled recordings match the Program view without those areas becoming solid black.