By the way, and not using a braille display, when I wanted to get the date announced when NVDA was running I did hold down NVDA then hit F12 twice in rapid succession.

The original post makes me think that NVDA+F12,NVDA+F12 was being pressed twice in rapid succession.  I used NVDA+F12 followed by just F12 in rapid succession, never releasing the NVDA key before both F12s were pressed.   I got the Save dialog in word, or the show elements panel in Brave, if I did NVDA+F12, released NVDA and then hit F12 again quickly.  But never when I depress NVDA, keep it held, and then hit two F12s in rapid succession before releasing NVDA.
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Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363  

Power is being told you're not loved and not being destroyed by it.

       ~ Madonna