I do not think so, but what would you have me (or anyone) do to test this?

I found this on the NVDA group, and when I went to individual message subscription I never changed between plain text and full-featured.  And checking just now, I can't recall or find how to change between plain text and full featured under Subscription, even looked under Advanced.
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Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134 
     Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

          ~ H.L. Mencken, AKA The Sage of Baltimore