API and leftwork update

Hello
I wrote some functions to rapidly declare meetings done when they are in the past and still in a previous state.
By means of the API, I manage to progressively change the state of such meetings and add a comment.

Yet, I remarked that no check is performed when there remains left work assigned to attendees. I can see in the meeting variables that leftWork is >0 , but I can change the state to "done" (not possible through the web interface).

What annoys me is that I cannot set leftWork to 0 in a API request for meetings. The requests return "Value changed" but actually there is no change.

Is it a bug or I should do differently ?

All the best