How to render single image with Path Tracer?

Development Rendering
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I admit, i haven´t used the High Res Screenshot since i got the Movie Render Queue to working for single images.
But in a quick test, it only rerendered the scene, if i use the Screenshot size Multiplier with a number other than 1. If you are using that, then you might need to add a delay, so that the rerender can complete with the denoising.

Capturing a Converged Path-Traced Image using HighResShot

Use the console variable r.HighResshotDelay equal to the currently active Samples Per Pixel in your scene. A good way to validate that the correct output is being captured is to leave r.PathTracing.ProgressDisplay set to 1. If the progress bar is not present in the captured image, sample accumulation is complete.

https://docs.unrealengine.com/5.0/en-US/path-tracer-in-unreal-engine/

What happens, if you just press F9 for making a regular screenshot after it got denoised, does it rerender then too?