This was first reported today on dewiki, after a message on Discord. I apologise in advance for vague information, but it seems to be a very particular situation that is difficult to reproduce.

What happens?:

• In 2020, the template Heiliger Stuhl was added to the article Republik China (Taiwan).
• The template was edited yesterday, leaving a broken file link (duplicated closing ]]).
• This led to Republik China (Taiwan) and all its versions since addition of the template not being displayed in Chromium browsers (tested in Chrome and Edge on Windows) anymore, giving an out of memory.

What should have happened instead?:
Even with a broken file link, the page should be displayed correctly in all browsers (especially the most-used one). The template also seemingly did not cause the same issue in other pages that were looked at.