One of possible solution to create screenshots under wayland without terminal session

[Engimono]

possible smooth solution:

1. install xdotool: sudo apt install xdotool
2. create a custom shortcut (as an example Super+Print) with the command: xdotool exec flameshot gui

As a result, it loads "flameshot gui" without creating a terminal session that could appear in front of the screen's part you want to take as a screenshot.