It seems that categories haven't been cleaned up for at least 9 months on huwikibooks—Kategória:Userbox sablonok was deleted and emptied on August 30 (emptying was a few minutes later, I think). Expensive special pages are cached for 2 weeks or so, Special:Categories shouldn't contain months-old entries either.
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I propose:
mwscript cleanupEmptyCategories.php --wiki=huwikibooks --mode=both --throttle=5000
Update the category table for huwikibooks, adding missing categories and removing non-existing categories with a wait time of 5 seconds between each batch.
Please paste the output of the script in a Paste.
Comment Actions
$ mwscript cleanupEmptyCategories.php --wiki=huwikibooks --mode=both --throttle=5000 ...Update 'cleanup empty categories' already logged as completed.
Comment Actions
reedy@terbium:~$ mwscript cleanupEmptyCategories.php --wiki=huwikibooks --mode=both --throttle=5000 --force Adding empty categories with description pages... Removing empty categories without description pages... --mode=remove --begin=Userbox_sablonok Category cleanup complete. reedy@terbium:~$