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Dynamic (non-explicitly declared) properties are deprecated as of PHP 8.2 and are expected to become a fatal error in PHP 9.0. In this case, it appears that the dynamically created `$has_setup_template` property is not actually used. It is unclear what the original intention was, but since it is undeclared and unused, it can be safely removed. Follow-up to [38832], [53557], [53558], [53850], [53851], [53852], [53853], [53854], [53856], [53916], [53935], [53936], [53937], [53938], [53942]. Props jrf, antonvlasenko. See #56033. git-svn-id: https://develop.svn.wordpress.org/trunk@53945 602fd350-edb4-49c9-b593-d223f7449a82