Rotobezier toggle can't be set from jsx for paths, buggy for masks
The API docs say both masks and paths have a .rotoBezier boolean that is read/write. I can get it to work for masks (but needs some special treatment), but not for paths. I've posted some example code and a video walkthrough on the forums: https://community.adobe.com/t5/after-effects-discussions/set-rotobezier-property-via-scripting/m-p/13117674
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