Denoise not compatible with .DNG file exported from Helicon Focus

[Berb12]

After stacking a set of images in Helicon Focus and exporting the final stacked image in a .DNG format, I cannot denoise the image in Lightroom. For other .DNG files that haven't been through Helicon Focus, the feature works.

[Rob_Cullen]

As I understand "Denoise" (in simple terms)-  The feature requires a raw image from the original camera capture that contains sensor data.

Helicon Focus (and other external apps) may produce a DNG file-type), but the file is more like a rendered RGB TIF file in a DNG file 'wrapper'- and so not compliant with the Denoise need for a 'true' raw file.

(A raw file converted to DNG is still a raw file in a DNG wrapper hence the feature works.)

[Berb12]

Is there a way around this? Thank you for the reply.

[JohanElzenga]

Is there a way around this? Thank you for the reply.
By @Berb12

Denoise the images before you create the focus stack in HeliconFocus.