It is still very difficult or rather impossible to draw a mask with multiple vertex without a few bezier vertex popping up. And yes I do not drag my mouse.
These few bezier are difficult to disable with alt clicking (often get a different icon).
This behavior has been present since day one.
For a non bezier mask I have to start with a rectangular to be certain I get no bezier. But this workaround can be somewhat cumbersome.
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