Hi there,
I've noticed that when creating a vector mask, it's very important to ensure that the mask shape does not have a stroke otherwise when exported to pdf it will be rasterised. See below screen record and source file:
Rasterise with stroke mask.mp4
Source file:
Rasterising example.afdesign
I can't see this being a useful or intended feature hence why I'm reporting it as a bug.
Thanks very much!
Max