* @return array[] Filtered version of `$block_list` containing only the passed `$block` and its parents.
	 *                 Or an empty array if `$block` cannot be found within `$block_list`.
	 */
	private function get_block_tree( $block, $block_list ) {

		foreach ( $block_list as &$_block ) {

			// Found the block.
			if ( $block === $_block ) {
				return array( $block );
			}

			if ( ! empty( $_block['innerBlocks'] ) ) {
				$tree = $this->get_block_tree( $block, $_block['innerBlocks'] );
			}

			if ( ! empty( $tree ) ) { // Break as soon as the desired block is removed from one of the innerBlocks.
				if ( $_block['innerBlocks'] !== $tree ) { // Update innerBlocks/innerContent structure if needed.
					$_block['innerBlocks'] = $tree;
					// Update innerContent to reflect the innerBlocks changes = only 1 innerBlock.
					$inner_block_in_content_index = 0;
					foreach ( $_block['innerContent'] as $index => $chunk ) {
						if ( ! is_string( $chunk ) && $inner_block_in_content_index++ ) {
							unset( $_block['innerContent'][ $index ] );
						}
					}
					// Re-index.
					$_block['innerContent'] = array_values( $_block['innerContent'] );
				}

				return array( $_block );
			}
		}