The policy Adobe maintains is this: settings in sidecar XMP files are processed if the XMP files are more recent than respective DNG files. Please check the dates within a pair of DNG and XMP files and see if XMP is more recent. If it is not, Lightroom will ignore it.
The policy Adobe maintains is
Dear Sir:
The policy Adobe maintains is this: settings in sidecar XMP files are processed if the XMP files are more recent than respective DNG files. Please check the dates within a pair of DNG and XMP files and see if XMP is more recent. If it is not, Lightroom will ignore it.