Inconsistent REV-X SEND Behavior Between dspMixFx and Stream Deck (Yamaha URC Plugin)

When the REV-X (SEND) of Mix1 is turned ON in dspMixFx, the REV-X (SEND) of Mix2 turns OFF automatically.
However, when both are set to OFF using the Yamaha URC Plugin on Stream Deck, the actual result is the opposite: both REV-X (SEND) paths become ON, even though the indicator lamps for both are turned off.

As you can see in the image, it is possible to independently adjust the reverb level sent to the front output (OUT 3/4) and to the in-ear monitor output (OUT 1/2).
This also applies to EQ adjustments.