ancestor
The `ancestor` field was recently added to the `block.json` schema in Gutenberg. See: https://github.com/WordPress/gutenberg/pull/39894. Props darerodz. Fixes #55531. Built from https://develop.svn.wordpress.org/trunk@53084 git-svn-id: http://core.svn.wordpress.org/trunk@52673 1a063a9b-81f0-0310-95a4-ce76da25c4cd