[http://google.com foo [[Category:Bar]] baz]
The above is not parsed as an extlink by Parsoid because the newline + category pair is recognized later in the pipeline by which time the text has been processed into "[", ExtLink, .., "]" tokens. So, at the same time that the newline + category pair is recognized, the preceding extlink tokens should also be fixed up.
I saw this on one page during visual diff testing ( so far based on investigating test results ). Example mznwiki page. The relevant wikitext on that page is {{coord|44|48|N|20|28|E|type:country|display=title}}
This looks like an edge case, but it is possible other mznwiki pages might be affected by this bug.