I am having exactly the same issue and it's really annoying. Currently working on Windows 10 Pro, OS build 19041.572, latest update for .NET Framework installed is KB4578968 (on 10/19), and on 10/15 a Feature update to Windows 10, version 2004, was installed and I believe that's when the problems started.
Displays are two AOC LM960s monitors, running on 1280x1024 resolution. RD is set to run at Full Screen, but I restore it and expect it to only occupy one screen with scroll bars about 20 times a day. Used to work just fine until these updated came along, now the restored window keeps growing and not showing any scrollbars every time I maximize and restore it. Help!