Button press states are reversed for Zooz Zen26 Switch and Zen27 Dimmer - since at least Indigo v7.4 and through the latest release, 7.5. Each switch itself behaves correctly with its own local control of the attached light/load. Reverse Switch Controls option changes the behavior of the load, but doesn't change Indigo's mis-reporting of the button presses.
Pressing ON (upper paddle) reports OFF pressed (switch turns light on)
Pressing OFF (lower paddle) reports ON pressed (switch turns light off)
ON/OFF control from the Indigo UI works as expected.
The incorrect reporting affects triggers that rely on the reported press, including scene control presses. Example: setting a trigger for ON button double tap or ON button hold, requires the OFF button to be pressed.