Prior to about September 7th, when adding of modifying an advanced relationship, someone could just paste a MusicBrainz URL including a MBID into the first search field, and the UI would automatically look it up, AND set the correct type automatically in the Relationship Type drop down list, located just to the left of the search field.

After around September 7, 2020, it will change most of the pop-up box to display all of the editable Relationship Attributes (like before), but it will no longer set the correct type in the drop down list, and the MBID URL never gets resolved to the intended target within the search field. So, the user must select the type manually, and then re-paste the MusicBrainz URL over again, so that it will be resolved/filled in correctly.

I figured that someone else would have reported this bug by now, but I haven't found a ticket. (So, hopefully this isn't a duplicate?) Anyway, this bug slows down editing a lot if you're adding a bunch of advanced relationships.