I was under the impression, that {meH}ed nouns as {QongmeH Duj} don't take verb prefixes.

However, a little bird told me that on "s.e. 1998.01.18" (whatever the ghe''or "s.e." actually is..), there is the canon sentence of:

{jIpaSqu'mo' narghpu' qaSuchmeH 'eb}

because I'm very late, the opportunity to visit you has escaped

And here, we *do* have a verb prefix on a {meH}ed noun.