Interesting that this affects us. From the change description, at least, I wouldn't expect handling zoom would change things for our smoke test.

This was the full bisect list:
https://chromium.googlesource.com/chromium/src/+log/02c23acd7d6c319ae7976208159e202abd246934..8384f1379a4346fc78da6945a335d947e75632f8

I didn't notice any other suspect changes.

oh, I think you're definitely right, I'm just trying to understand why our number would change. I have no idea what the larger implications of PropertyTreeState::Root() vs frame.LocalFrameRoot().ContentLayoutObject()->FirstFragment().LocalBorderBoxProperties() are, though :)

when I try out the crbug's demo https://output.jsbin.com/wegixex using m91 and m92 (where the change landed), I'm not getting different CLS score or weightedScoreDelta in Lighthouse

@patrickhulce pointed out that the demo page has a <meta name="viewport" content="width=device-width"> but our smoke test does not, which would affect zooming. Adding a meta viewport to the smoke test makes it so CLS doesn't change from m91 to m92, so that probably solves that mystery.