When I did encodings with "NNEDI(dh=true,field=1).TurnRight().EEDI2().TurnLeft()" the lasers of the imperial starship over Tattooine sometimes turned from green to white and looked a littlebit like bubbles.
Now I tried your script from the 20.03. with "NNEDI(dh=true,field=1).TurnRight().NNEDI(dh=true,field=1).TurnLeft()" and everything works fine.