Propagating metadata to versions removes ICC profile from the versions

[Pawel]

Some of my JPG files have ProPhoto color profile embedded. When I want to replace JPG in the database with a new version I use workflow described in this post.
 
I noticed that as soon as I propagate metadata from the old files (the masters) to the new files (the versions) the colorspace information is removed from the new files - when I open them in Photoshop I get a message there is no color space/no color profile embedded. As soon as I assign the files ProPhoto colorspace and save them they are displayed correctly again. 

Any idea what is wrong? 

[Mario]

What data do you propagate? I'm sure IMatch is not removing the ICC profile intentionally, but metadata is complex and propagating to much or to less can be an issue. Also, it might be a side effect of copying the metadata and the way ExifTool handles this. 100 different reasons. More information and details needed.

Made a quick test, using a DNG and a PSD with embedded Pro Photo ICC profile. Saved both images to a JPG. Made the JPG versions of the corresponding master. Used a standard propagation with rating/label/collections/All XMP IPTC and IPTC Core data (safe for propagation).

Wrote back the masters. Metadata correctly propagated, ICC profiles unchanged still Pro Photo in both masters and versions. Do not, for example, propagate EXIF metadata between files. Always dangerous.