Example: When translating Florence Dauchez from French to English, in the first translated revision several links were created with full URLs, such as //fr.wikipedia.org/wiki/Festival_international_de_Leipzig.
All of them either were either red in the French Wikipedia, or they did exist in French, but not in English.
They definitely shouldn't be added like this. They should either not be links at all, or they should be local red links inside English.
This is similar to T118087, but that bug talks about links such as [[:fr:Title]].