No longer can take screenshots of RDP windows in MacOS

Question

In the past it was possible to take screen shots using the MacOS screen shot tool (Option-Shift-4 to select an area of the screen) of RDP windows; However, trying to take a screen shot of an RDP window now (using Microsoft Remote Desktop Beta, Version 10.7.1 (1942)) the screen shot ends up being whatever is behind the RDP window, it is as if the RDP window doesn't exist.

Has something changed? This was an incredibly useful arrangement and, in fact, was the best way to get screen shots of Windows.