4050 and 4051 generates large thin black square/line in the depositmask.
Even if I export the mask the line will show up.
Download picture and zoom in on the white area you see black squares.
Just set project to 1024x1024
Then connect a Colorizernod to Depositmask on the Erosionnod. Start moving the slider inside of the Colorizernod to make it lighter. The line will then start to apear.
I can not see these square in other mask on the Erosionnod