[xvilka]

Some frameworks don't have support for Wayland. So it might be not up to the program authors. World is not limited to GTK and Qt. One such example is Java.

[mateuszf]

The X11 support in Java wasn't so good either AFAIR. Remember having problems with AWT/Swing apps in tiling window managers in the past.

Also, there is some ongoing work on Wayland in Java - https://www.phoronix.com/scan.php?page=news_item&px=Wakefiel...