P: Content Credentials-signed images will create an XMP file for JPEG images

I recently come across the following Issue:

I have a bunch of jpg files I have post-processed in Photoshop that I want to add geo locations to using the Lightroom Classic map module. After adding the locations I mark all images and do right click - metadata - save metadata to file. For some jpg files the data is written into the jpg file (desired behavior and how I know it from LR Classic for the past 6 years), while for others LR creates a seperate xml file (same location same name as the jpg) containing all metadata including the location.

Since this is a recent thing for me I suspected LR 14 to be the issue so I downgraded back to 13 but the issue persists.

I already cleared out my complete LR catalog and only importet a hand full of jpg files to test but the issues persists.

The issue can be reproduced, it is always the same jpgs causing the issue.

When I open one of the not functioning jpg files in Photoshop and save it again in a new location the issue persists. When I open it, create a new document of the same dimensions, mark all in the original, copy across to the new document and then save the new document as jpg I can then add gps locations to the new jpg in LR as expected.

I can also copy the gps data from a working jpg to one of the ones LR refuses to add gps data to using exiftools so the jpg file does not seem to be inherently broken in some way.

There is no different between the jpg files LR can write to and the ones where it insists on writing a xml file. They were taken using the same camera and have gone through the same workflow.

Any help would be appreciated since as of right now I am resorting to using a dummy image I assign the desired location to in LR and then use command line + exiftools to copy the gps tag across to the non functioning jpg which is extremely cumbersome.