Nuno Andrade

To be more clear...

I'm a new Affinity designer user. I'm in this very instant trying to solve a similar issue. On Illustrator, to prevent this from happening, I first turn it into a compound path and only then I'd expand or punch out from another object. That seemed to work really well on complex shapes, but I'm still struggling to solve this here - the solutions above are not ok because you might want to use lots of points for a complex shape.