Hey,
I ran into this very same issue, especially as I have a program that loves to open on a screen that's never connected.
Something I found on Reddit is it appears Microsoft have made a change that to be able to move a window with such behaviour now, you need to hover over the taskbar icon, when you get the preview window, right click on this and you can then select move there is now no need to fold shift before right clicking, this then will allow you to select move.
Reddit link for reference https://www.reddit.com/r/WindowsHelp/comments/1dpo3o4/shift_right_click_not_working_on_running_tasks_in/