Viewport save misses some elements

Hi all,

I’ve got a weird problem with Viewport save. I’m animating a mass number of drawings, and while the viewport, and the animated bmp seems fine, the viewport save generated file seems to miss some elements.
I would like to use custom lineweights for example, and a “cutout” shape.

while the viewport save file looks like this:

this is not the biggest issue, sometimes the white cutout shape is completely missing:
animated file:

while the viewport save file:

anyone had similar issue?