Issue: Errors Errors Errors Rebuilding Link Cache

The biggest error is that database errors occur if a non-wiki thread had a corrupt namespace ID, because these threads are not corrected when rebuilding the article list.

Aside from that, wiki posts are not considered as wiki posts, so things like redirects or template usages are not added to the cache.

Fixed in 2.1.0 by checking for namespace corruption here and running some additional logic similar to the preprocessing done in the special_postdata_postsave plugin.