It appears this may have something to do with the gameobjectcache.wdb file in the cache/wdb/enus/ folder, this would explain why the problem seemed to be fixed after the mini patch (as patches erase all the cache files) and why it re-appeared after a reload/restart of the game client. What the spacific problem is lies beyond me as I am not an author, but maybe this will help point in the right direction.
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