I'm relatively new to using the Affinity suite, so I've been following a lot of tutorials. I noticed that if I'm using a mask as the top layer in the group, and I the group blend mode is set to passthrough, image 1 happens (notice the weird snake-like shapes, those are brushstrokes where I was brushing stuff out of the mask). If I have the group blend mode set to normal, image 2 happens (you can see the same areas are brushed out without those weird brush stroke marks).
Is this what it's meant to do? I ask because I was following a tutorial, and I had my workflow set up *exactly* the same as the presenter, and this did not happen to him when he had his on passthrough (image 2 is what his looked like).
If that's not meant to happen, how do I fix this?
Thank you.