P: Overwriting Metadata on Copy to Cloud Removes People Tags

I'm using Lightroom 9.0 in Windows to organize photos. I've learned that if I manually add keywords to a photo in the "Cloud" tab, the same photo on the "Local" tab doesn't get the keyword whereas if I add keywords to a photo on the "Local" tab and then copy it to the cloud the keyword appears in both places. If I had previously copied the photo to the cloud, I just need to check the box to overwite metadata. Today I noticed there's a catch: Overwriting the metadata removes all the facial recognition people tags from the cloud version of the photo. I've lost thousands of photos worth of facial recognition people tags by working on the manual tagging in "Local" and copying the manual tags to the cloud.

Steps to reproduce the issue:

1. In Lightroom 9.0 on desktop in the "Local" tab, copy a photo of a person's face to cloud
2. On the "Cloud" tab, note that Lightroom identified a face
3. Return to the "Local" tab, add a manual keyword and copy to cloud again, checking "overwrite metadata"
4. On the "Cloud" tab, note that the facial recognition results are gone

The only solution I've found is to delete the photo from the cloud and re-upload. The re-uploaded photo is scanned for faces as usual upon upload, and I have to start over helping it merge and name the recognized faces.