Using the new Impeller interop toolkit, and I've run into a fairly elusive issue that causes path fills to not be drawn when they should.

The issue seems to involve interactions between transforms, clip regions, and the DisplayListBuilder save stack. After adding lots of logging, I've reduced the issue down to a fairly simple example: https://gist.github.com/lyceel/de6d80caffb3c209d3dadbdfd10447de

With the code as it is, the path is not filled at all:

If either the rounded rectangle's transform (Option 1 comment), or the unused clip (Option 2) are commented out, the path is filled properly with red:

I recognize that the simple solution would be to remove the useless save/clip/restore block in the middle, but this is much more difficult to prevent in the real-world use case where this issue was discovered.