Report is invisible for a user with granted Ready-Only access right

I granted access to one of the users (not group) to have read-only access to Deal db. Other charts are shown, but the histogram one isn’t. - unless I grant read-only right on the Space itself which I don’t want to do (then the chart becomes visible).

At the same if I unfold the Sales item and click “Monthly Sales”, chart is also visible.

Is this a bug?