Links existing in articles at Norwegian (nynorsk) Wikipedia (nnwiki) is not retained during translation to Norwegian (bokmål) and further publishing. If the link is marked as "missing" it is retained during publishing, and if it is removed and then re-added then it is also retained.
Screendump of an article from Norwegian (nynorsk) Wikipedia during editing. Links there, as it seems..
This link has a working pairing to the article at Norwegian (bokmål) Wikipedia.
Then publishing the article the links are not retained.