WorldNormal Scene Texture Blendable only works with "Capture Every Frame" enabled on SceneCaptureComponent

Trying to render out the world normal from a SceneCaptureComponent2D, I’m using a simple post-processing material that outputs the SceneTexture:WorldNormal color, and applying it to the capture component.

I noticed, however, that the blendable doesn’t seem to get applied unless the capture component has the “Capture Every Frame” set to true.

Is this intentional or is there a way around it? I’d rather not be refreshing this every frame if possible.