* @param array $block Parsed block array.
	 * @return bool
	 */
	private function is_block_visible( $block ) {

		// Make the block return a non empty string if it's visible, it will already automatically return an empty string if it's invisible.
		add_filter( 'render_block', array( __CLASS__, '__return_string' ), 5 );

		// Don't run this class render function on the block during this test.
		remove_filter( 'render_block', array( $this, 'render_field_block' ), 10, 2 );

		// Render the block.
		$render = render_block( $block );

		// Cleanup / reapply filters.
		add_filter( 'render_block', array( $this, 'render_field_block' ), 10, 2 );
		remove_filter( 'render_block', array( __CLASS__, '__return_string' ), 5 );

		/**
		 * Filter whether or not the block is visible.
		 *
		 * @since 5.0.0
		 *
		 * @param bool  $visible Whether or not the block is visible.
		 * @param array $block   Parsed block array.
		 */