By the way, NVDA 2021.3 is now released, and I upgraded from the RC1 to the production release just a short while ago. I'd suggest you do the same and double check to see whether the issue you are having persists. I suspect it will, but I'd prefer we both be on the latest release of NVDA, at the very least.
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Brian - Windows 10, 64-Bit, Version 21H1, Build 19043
The stoical scheme of supplying our wants by lopping off our desires is like cutting off our feet when we want shoes.
~ Jonathan Swift (1667-1745)