Inventory equipment bar no longer adds more rows to accommodate extra slots that have been modded in.
If there is only 3 extra slots, they will display in the 2nd row as normal, but no 3rd row is created for the 4th, and it cannot be viewed anywhere.
The slots are still useable, as the relevant items do seem to attach when dragged onto the player, but they cannot be seen in the bar.
So once items are attached, they will not be able to be removed as they do not show in the equipment bar.