ZZ'Rot Portal, bonus damage tooltip 0!

I tried to take a screenshot, it didn't work for some reason and I only found this out after the game. Champ: Nautilus Side: South Bug: Tooltip claims bonus damage from armour and magic resist is at 0. This does not change when something changes, like actually using the active, nor when buying an item with MR or armour. In reality, the bonus damage is fine. It's just the tooltip. When: Started my first game buying one after the patch (which contained some item changes for the item).