Multiple update : doesn't change "done" status

Hello,

I try to delete multiple activities.
Some of them are "done" and progress is set to 100% (fixed duration and progress set by passing status "done" previously).

I set status to other (permitted by workflow) with no "done" state.

Flag "Done" is not reset when changing status, so progress remain 100% (even with return to "recorded" status).
I can't delete these activites (because of "real work present", this is right, except that, in the state of activity, real work must be 0).

If i change status one by one, i can reset "done" state and turn progress to 0, so i can delete the activity.

I think it is a bug, perhaps due to control with real work in other planning mode than "fixed duration" ?

Regards,

Strange behaviour, i notice that the first activity of the list in multiple update is correctly set...
So, if i repeat multiple update for each activity, i can set the right value...