There is another bug report for sddm that mentions xdg-desktop-portal (currently the second item in the list shown at the below link).
https://bugzilla.redhat.com/buglist.cgi?bug_status=NEW&bug_status=ASSIGNED&bug_status=CLOSED&columnlist=product%2Ccomponent%2Cassigned_to%2Cbug_status%2Cshort_desc%2Cchangeddate%2Cbug_severity&component=sddm&order=status%2C%20assigned_to%2C%20id%2C%20&product=Fedora&query_format=advanced
Edit: Well, I thought that link would keep the sorting. But it looks like it didn’t. Just click twice on the “Changed” column to get the bugs sorted by date with the newest ones at the top.