Click tweet button on full screen mode (Mac OSX), Half of addressbar disappear!

kyu3

kyu3

I use Opera Next 21 (Ver. 21.0.1432.31). When I use Opera on full screen mode of OSX, Click tweet button on the webpage, the half of addressbar disappear!

alt tweet button bug

And this bug arose on iWork for iCloud, too. Open new document on full screen mode of OSX, the half of addressbar disappear!

alt icloud bug

This bug existed on Opera Next 20, too.