Photos.app metadata export broken, keywords missing, other data improperly encoded
In Big Sur 11.1 Beta (20C5048k) the Photos app does not properly export metadata.
I have made a test with an old photo A with keyword, description, and location data, where I have successfully exported the metadata under Catalina, and a new photo B that I imported in Big Sur and then assigned similar metadata. Exporting under Big Sur will only process the Description data, but this data is only visible in Finder and not properly encoded in the file.
Apart from the missing keyword data in the Finder, I can see an issue when uploading to the Squarespace site. If I export photos A and B from a Big Sur Photos export and upload them to Squarespace, neither carries its description information with it. Bit, if upload a Catalina exported version of Photo A from my archive to Squarespace, the description metadata does carry over, (but the keywords do not - this is a long standing issue I have, and not urgent).
Has anyone else noticed photo metadata export issues with Big Sur Photos?
MacBook Pro 13″, macOS 11.1