Synced Realm -> synced Realm conversion fails to sync with server

[sync-by-unito]

When invoking realm->write_copy(<path>, <encryption key>); to copy one synced Realm to another synced Realm, subsequent attempts to upload changes to the server stall and timeout -- even when there are no changes.

wait_for_upload_completion (here) does not not return when called on the newly created Realm.

Reproduction (in JS) and logs are available if needed.