Ceiling gaps with room dividers

[RNDesign]

I am creating a second floor nook above the kitchen open on one side.  The ceiling above is sloped and I notice the room divider creates a gap in the ceiling the same width as the wall underneath and slices out the small section of the ceiling above.  Is there a way to prevent this so that I can see the full uninterrupted ceiling?

[RNDesign]

4 hours ago, solver said:

Someone will need your plan file to understand why it's happening. Close the software before attaching.

Thank you for the helpful info.  I've attached the file.

Paris.plan

[solver]

Draw in your own ceiling plane and uncheck the option shown.