Hybrid Stone Powder not recognized as separate resource

Once a hybrid stone (of two of the same stone) is turned into stone powder, it is not recognized as separate from a stone powder of the same stone. For example, 2x Marble -> Hybrid Stone -> Stone Powder (Marble)

The hybrid stone powder will retain its 8% value until it is combined (either intentionally or not) with existing Stone Powder (Marble) created from non-hybrid marble. The entire stack is then set to 4%. Separating each out individually shows they are now all 4% bonus.