Floating windows don't reappar after coming out from fullscreen state

I'm using Zathura as my full-screen window in my tests. To reproduce, 

- Open 3 windows, A, F and Z.
- Float window F.
- Make window Z full-screen (press F5 in Zathura).
- Undo Z full-screen (press F5 again in Zathura).

Expected: Z is tiled again; A, B and Z are visible.
Actual: Z is tiled again, but window F is invisible.