Pies, rings and arcs reset to discs on scene save on custom mask settings

Reproduces 100% of the time.

Steps:

1. Create an arc shape in the scene with Right Click/Shapes/Arc
2. Set Masking/Ref to 1
3. Set Angle start to 1
4. Save the scene
5. The arc now renders as a disc

Steps 2 and 3 are just for the sake of example. This happens when there is any change to a masking setting and any change to a regular render setting (thickness, angle start/end, ...).

It fixes itself when the scene is reloaded or when you toggle another shape type and back.

How it looks pre scene save:

How it looks post scene save: