Custom controller parameters are not intercompatible(in preview)

Hello, when inserting custom parameters from the library I find that parameters made for Slot A(for example) are not compatible and can't be dragged onto SLOT B and vice versa. As in the picture the parameters made for the slots marked with the green lines can't be dragged onto the slots with the orange lines. This seems like an oversight. Thanks. Whoops sorry, just tested this again and they CAN be dragged they just can't be previewed which is a different issue, not even sure this is an issue that can be fixed because I know usually slots are marked with the destinations and changing this might be breaking some logic for the other parameters.