I recently discovered https://browsersl.ist/#q=defaults via https://github.com/nextcloud/server/issues/40793. It seems many websites discriminate against anything older than the previous Safari minor version, not major version. This is really unfortunate. We'll have to be more aggressive with updating the fake Safari version.
Pull request: https://github.com/WebKit/WebKit/pull/18760
Committed 269169@main (f0755ec8caee): <https://commits.webkit.org/269169@main> Reviewed commits have been landed. Closing PR #18760 and removing active labels.