Hi Don,
Thank you for sharing your file.
That looks like a bug as you suggest. We will fix that for the Fall 2023 release:
github.com/NREL/SAM/issues/1633
As a workaround, you can export the "System power generated" output variable for each of the PVWatts and Wind Power cases, and use a spreadsheet program to add the hourly values to use with the "Import hourly or subhourly generation profile from file" option on the Generic System Power Plant page.
The Fall 2023 version of SAM will introduce hybrid system configurations, including PVWatts / Wind configurations. We hope to release that version in a couple of weeks.
Best regards,
Paul.