[22:19:44] <anomie>	 subbu: Re your question from probably 2 days ago: Because some people think it's a good idea to check {{REVISIONID}} being 0 as a proxy for "is this being previewed" so they can display extra error crap. The only way to avoid it (without changing the templates/modules to stop doing that) would be to update the ParserMigration code to pass a revid when it calls $content->getParserOutput(). See also bugs such as T141970.
[22:19:44] <stashbot>	 T141970: Deprecate and replace REVISION* magic words and inline errors with a proper warning system - https://phabricator.wikimedia.org/T141970