HomeKit: unlock already unlocked lock with knob – does not work

I switched from Nuki 2 to Nuki 3.0 Pro.
When the door is closed but not locked, Siri is not longer opening the door with the Nuki 3.0 pro.
with my old Nuki 2 it still works. I already reconfigured Homekit integration but no improvement.
Is this a firmware Problem?
My Nuki 2 does.