Steps to reproduce
- Open https://ru.wikipedia.org/wiki/Янская_стоянка
- Click the CX URLs in the sidebar, I have tried Ukrainian and English as translation targets
- Critical error: Content translation failed to load due to internal error.
- Page loads for translation
Investigation and impact
Pages using map frame feature from the Kartographer extension fail to load in Content Translation. This is because those features uses data-mw HTML attribute in ways not expected by cxserver, causing cxserver to fail when processing the page.