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https://developer.apple.com/documentation/metal/developing_metal_apps_that_run_in_simulator?language=objc

This is definitely the cause of that regression.

auto label is removed for flutter/engine, pr: 36622, due to - The status or check suite Windows Host Engine has failed. Please fix the issues identified (or deflake) before re-applying this label.

Windows failure looks like a flake in impellerc...