It is correctly treated as inherited in RenderStyle but not marked as such in CSSProperties.json.
<rdar://problem/113853280>
Pull request: https://github.com/WebKit/WebKit/pull/16665
Committed 266871@main (59fc68749e0e): <https://commits.webkit.org/266871@main> Reviewed commits have been landed. Closing PR #16665 and removing active labels.