<nop> misbehaving?

It used to be that putting "<nop>" before a CamelCase word had two
effects:

a. When editing in(x)emacs, it prevented emacs-wiki-mode treating the
CamelCase word as a potential link. In other words, hitting <CR> when
over the word didn't open a new buffer, and the CamelCase word in
question wasn't fontified like a link (and the <nop> itself was nicely
hidden).

and

b. When publishing, the CamelCase word wasn't translated into a link or
a mailto.

I now find that although a. still works, b. is no longer the case.  My
<nop>'ed Camelcase words are being published to html as mailto links. Is
that as it should be?

tc