Tick and untick "small staff" and "invisible staff line" (Staff properties) works badly

MuseScore 2.0 Beta 1 / Windows7

1) Default score
2) Fill the first measure with some notes
3) Clic right -> Staff Properties.
4) Tick "Small staff" -> Apply

Result: correct

5) Untick "Small staff ->Apply

Expected result: return to the staff initial size
Real result: the small staff remains.

- The behavior is the same by ticking (-> Apply) and unticking (->Apply) the "Invisible staff lines"

Remark:

These two functions seem to have suspicious links, seeming interacting with each other. Try switching from one to the other, and vice versa, with variations on the functions, ticked or unticked, and you will see some unexpected behaviors.

Example:

1) Tick "small staff" -> Apply -> Untick -> Apply (bad result always)
2) Tick "invisible staff line" ->Apply

Surprising result: the staff comes back to the initial size.