It looks like these failures are because we're looking at the exactimg tag markup for the "Modern Image Formats" plugin, which of course was changed as of committing sizes="auto" to Core.
Steps to reproduce
You should see those failures as soon as you open any PR, or run unit tests locally against WordPress trunk.
Bug Description
See e.g. https://github.com/WordPress/performance/actions/runs/10820446352/job/30020524054?pr=1492: The PHPUnit tests fail, but that's entirely independent of that PR.
It looks like these failures are because we're looking at the exact
img
tag markup for the "Modern Image Formats" plugin, which of course was changed as of committingsizes="auto"
to Core.Steps to reproduce
You should see those failures as soon as you open any PR, or run unit tests locally against WordPress trunk.