Last modified: 2013-07-11 15:34:35 UTC
If you add categories to a page and save, the newly-loaded version does not include the new additions.
An additional note about this on English Wikipedia, with the sensible suggestion that editors are likely to think they have done something wrong when they save the page and their changes do not appear to have worked.
Yeah, this would be a good one to fix; merging with duplicate. *** This bug has been marked as a duplicate of bug 48560 ***