When having set PM to "Combined RAW+JPEG" it's always the JPEG's IPTC data that gets displayed.
When applying an IPTC stationary to a combined RAW+JPEG even the JPEG's capture time will get inserted into the RAW-file (even if date/time was not checked in the stationary!).
Usually the time would be the same, but if the JPEGs are extracted from RAW and "preserve EXIF/IPTC" was not checked, the JPEGs have the extraction time as the capture time.
And then the RAW-files will get that time too ...
Why not have a switch that determines who's data will be preferred for read and write - JPEG or RAW.
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Cheers!
Thomas