The user right config for Arabic Wikipedia assigns the patrol right to the autoconfirmed group; this has been the case since the first revision of the wmf-config repo.
However, the autoconfirmed group has a duplicated key for autoconfirmed right below, which prevents the previous setting from being applied. This other line was added in r305573 / T142450 (2016); so, the original setting has had no effect for the last 9 years.
For the time being we are simply dropping the unused line, but we can add it back if the community wants it.