Created attachment 805996 [details] screen-above-bmp-test.txt - cat attached test file into a gnome-terminal: all characters are displayed correctly - start a screen in the same gnome-terminal and cat the test file again: Only the characters from the BMP are displayed correctly, for those above the BMP, replacement characters are shown.
Created attachment 805997 [details] screen-above-bmp-does-not-work.png Screenshot which shows that it works in gnome-terminal without screen, but not in gnome-terminal with screen.
Created attachment 1016678 [details] screen-above-bmp-f22.png Works in Fedora 22 Beta.
Actually it already works in Fedora 21, both Fedora 21 and Fedora 22 Beta have screen-4.2.1.