We have a Widgets (http://www.mediawiki.org/wiki/Extension:Widgets) extension installed and it appears we are not able to render a result from #widget parser function there.
The issue is that Parsoid doesn’t have a mechanism to register hooks,
https://github.com/wikimedia/mediawiki-extensions-Widgets/blob/master/Widget...
`WidgetRenderer::outputCompiledWidget` would normally decode that content.
See https://phabricator.wikimedia.org/T55874 to track the issue.
Thanks for investigating the issue.
Meanwhile I have implemented a workaround by postprocessing Parsoid's output via a custom version of mwoffliner ( https://sourceforge.net/u/svadim/kiwix-other/ci/master/tree/mwoffliner/)