This bug has been present for awhile now, not sure if it’s being fixed or not but when you mask something, the collision of that masked object is still present when it shouldn’t be.
In this example, I masked a grass texture into a small square. When I select an area other than the square, the grass texture that I masked into the square is still selectable when it should be confined to the small square
I’m happy to let you know that this issue has been resolved! If you haven’t already, please update to the current App Store version of Vectornator to check it out and don’t hesitate to let us know if it should pop up again.