MTX Combining Issue

I am trying to combine an Aqueous Essence (Mana) character effect that was purchased pre-patch with an Aqueous Essence (Life) effect that was purchased post-patch. When I go to combine them I receive the error message "An argument was invalid" in chat and the MTX do not combine.

Same issue with the Aqueous Essence mtx. Cannot combine them in any combination, same message in chat.