Affects some tests in Interop 2023: https://wpt.fyi/results/css/css-contain/container-queries?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2023-container%20container-units-in-at
<rdar://problem/106738942>
We are only failing following now: container-units-in-at-container-fallback.html