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If a universal camera is used with a custom depth of field bokeh aperture texture, enabling the denoiser will cause the image to render darker than without it.

normal render denoised render c4d 2025.1.2
octane 2024.1 r3
4090 565.90

This is unrelated to samples, the full final shots rendered here are on 8000 samples and render cleanly with no noise. They go darker. The images attached to this bug report use fewer samples to show the problem quickly.

It is literally a darkening bug caused by the denoiser.

Thanks for the report. This issue is a bug in Octane core and will be fixed for future releases. As a workaround until then, you can use a texture where none of the pixels are pure black (e.g. very dark gray).