Incorrect COLR Emoji Rendering

[DJMcNab]

Compare the rendering of the same Emoji in the bitmap and colr formats:

Bitmap:

COLRv1:

These are both snapshot tests within the repository (vello_tests/tests/emoji.rs).
The issue to observe is the confetti in 🎉. The top (bitmap) image shows the expected rendering (ignoring any artifacting).

The root of this drawing is DrawColorGlyphs in vello/src/scene.rs. My suspicion is that there is a mismatch with transformation handling between our code and the COLR spec.