@Riot Remnant of the Watchers This Patch

I know originally and were going to have reduced mana regen this patch and followed suit. However the changes for the first two were reverted but the change for still shipped despite not being listed in the official patch notes.

Is there a reason for this? Because it seems like an oversight that wasn't reverted and now supports lose mana regen when they finally complete the item (even if it isn't a large amount).