Big bug. Simple to replicate. Workaround included here.
If you export an image with both DNG and JPEG formats selected, the JPEG will be about 3 stops darker than it should be. So, you'll have an unusable JPEG.
If you change the names of the export preset, so that the JPEG preset is listed before the DNG preset, then the JPEG is exported correctly.
Hope this helps someone here.
Using the current version of ON1 Photo Raw 2023 (as of today). Bug report submitted to ON1.
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