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

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.