After updating to 4.14.1, these messages appeared.
WARNING: /plugins/CoreHome/DataTableRowAction/RowEvolution.php(266): Deprecated - Creation of dynamic property Piwik\ViewDataTable\Config::$show_series_picker is deprecated - Matomo 4.14.1 - Please report this message in the Matomo forums: [LINK REMOVED TO ALLOW POST] (please do a search first as it might have been reported already) (Module: CoreHome, Action: getRowEvolutionPopover, In CLI mode: false)
WARNING: /plugins/CoreHome/DataTableRowAction/RowEvolution.php(273): Deprecated - Creation of dynamic property Piwik\ViewDataTable\Config::$external_series_toggle is deprecated - Matomo 4.14.1 - Please report this message in the Matomo forums: [LINK REMOVED TO ALLOW POST] (please do a search first as it might have been reported already) (Module: CoreHome, Action: getRowEvolutionPopover, In CLI mode: false)
WARNING: /plugins/CoreHome/DataTableRowAction/RowEvolution.php(274): Deprecated - Creation of dynamic property Piwik\ViewDataTable\Config::$external_series_toggle_show_all is deprecated - Matomo 4.14.1 - Please report this message in the Matomo forums: [LINK REMOVED TO ALLOW POST] (please do a search first as it might have been reported already) (Module: CoreHome, Action: getRowEvolutionPopover, In CLI mode: false)