Web API state values not updated by nightmode locking

I use the nightmode on my Smartlock Pro 3 (fw 3.5.12) to lock the door in the evening. I wonder why this locked state is not updated in the api state values.
Is this a bug or by design ?

I experienced this problem several times but i can’t reproduce it under normal circumstances. So it seems to be a minor problem specific for my own combination of Hormann door + Smartlock.