RestoreRig DeNoise is not applied when rendering

I am trying to remove noise from my wave file and save it as new wave again, with denoising applied.

The denoising works fine, when I play it back. But when rendering only the other plugins are applied, no denoising.

This looks a bit like RestoreRig does not render in WL Elements 9.5, but this is three years old, so I don’t think that this is the same bug.

I let the denoise plugin listen to another wave file containing silence, and then I tried to apply it to the main noise file. This works fine, but only when playing it back, not when rendering.

Any ideas what I might do wrong?