Petrified oak slab in Creative Inventory

On the 1.16.5 Creative Inventory Petrified oak slab appears in the Building category after the cut sandstone slab. I assume this is a bug created in 1.16.5 by accident as it isn't found in the 1.16.4 release Creative Inventory. It may be a minor bug but I don't think that it was supposed to be created.