Even with that flag off, the family of CSS Motion Path properties are parsed and accounted for during rendering. They should not.
<rdar://problem/93522039>
Pull request: https://github.com/WebKit/WebKit/pull/743
Committed r294534 (250789@main): <https://commits.webkit.org/250789@main> Reviewed commits have been landed. Closing PR #743 and removing active labels.