Calling wfMsgWikiHtml() / wfMsgExt( 'parse' ) / wfMsgExt( 'parseinline' ) inside a tag hook exposes the UNIQ for the edit sections.
They call $wgOut->parse() which in turn use $wgParser, which is the same as the parent parser, whose state gets reset.
Version: 1.17.x
Severity: normal