Discovered this while writing https://github.com/web-platform-tests/wpt/pull/41614.
<rdar://problem/114371380>
Pull request: https://github.com/WebKit/WebKit/pull/17010
Committed 267265@main (38e8e38b9f1f): <https://commits.webkit.org/267265@main> Reviewed commits have been landed. Closing PR #17010 and removing active labels.