I'm standing with a running engine, throttle in an area where the aircraft would begin to roll but parking brake set. Then I push both brakes on my pedals and release the parking brake. And the Caravan will begin to roll.
I did an inspection using the variable observer of Axis And Ohs. And I see these values before releasing the parking brake:

• (A:BRAKE PARKING POSITION, Bool) = 1
• (A:BRAKE LEFT POSITION, Number) = 1
• (A:BRAKE RIGHT POSITION, Number) = 1

After releasing the parking brake, no matter if I use my hardware or the click spot inside the cockpit, all values are changing to 0 resulting in a rolling Caravan. I have to move the brakes again to have the brakes set to full again.

If possible it would be nice to have that fixed, because I would expect that releasing the parking brake with pushed normal brakes would still apply full brakes.