Hairline borders always visible

[FilledStacks]

Hey Team,

I've been experiencing a bug as I'm using rive.

This is visible in the MacOS editor as well as on the runtime on device.

Here is a screenshot of the artboard in the editor.

Context:

• The artboard fill is orange
• The circle you see is the dark grey in the foreground

As you can see that circle covers the entire artboard, but somehow the background is leaking through on the edges of the artboard as a 1px border.

I thought it might only be in the editor, then ran it (in a Flutter app) to fit height, so I can see the entire artboard. Here's a screenshot of it happening on device as well.

I didn't know where to file this bug since there's no place for the app to file issues.

Is there a workaround for this?