I'll have to check on my Windows 10 computer, but on my Win 7.  I use 2 monitors.  (MultiDock exclusively on the 2nd).  
 
Hitting Full screen only adjusts the Main Screen.  The 2nd, MultiDock screen does not change at all.  (Honestly, I think it should remove the strip at the top).
 
I do not have any bugs getting out of full screen though of the Main monitor.  I can either hit the Full Screen button or Window Full Screen (check + uncheck)

I can't comment on any bugs as I run it with the normal screen size to the monitor window so going full screen (maximized) doesn't gain me much.
 
However, to restore your screen you might try Alt+Space and then r.

full screen display not performing as described here, either
 
works perfectly on my single screen setups, but on the dual screen (using extended mode) where I usually have Sonar maximized on one screen, plugs and utilities on the other, it first comes up with something odd (garbled display) ... when I get out of and back into full screen, display is OK, but not fully full screen (task bar still visible) ...