Oops, I messed up a preprocessor guard. Now the new API version is putting HSTS storage in the old compatibility location, while the old API version is putting HSTS storage in the new location.
Pull request: https://github.com/WebKit/WebKit/pull/10873
Committed 261018@main (ee3d66cfa896): <https://commits.webkit.org/261018@main> Reviewed commits have been landed. Closing PR #10873 and removing active labels.