@@ -543,7 +543,8 @@ function _inject_theme_attribute_in_template_part_block( &$block ) {
 		'core/template-part' === $block['blockName'] &&
 		! isset( $block['attrs']['theme'] )
 	) {
-		$block['attrs']['theme'] = get_stylesheet();
+		$attrs = $block['attrs'];
+		$attrs['theme'] = get_stylesheet();
 	}
 }
 
 
@@ -1200,7 +1200,8 @@ function block_core_navigation_typographic_presets_backcompatibility( $parsed_bl
 		foreach ( $attribute_to_prefix_map as $style_attribute => $prefix ) {
 			if ( ! empty( $parsed_block['attrs']['style']['typography'][ $style_attribute ] ) ) {
 				$prefix_len      = strlen( $prefix );
-				$attribute_value = &$parsed_block['attrs']['style']['typography'][ $style_attribute ];
+				$attrs           = $parsed_block['attrs'];
+				$attribute_value = &$attrs['style']['typography'][ $style_attribute ];
 				if ( 0 === strncmp( $attribute_value, $prefix, $prefix_len ) ) {
 					$attribute_value = substr( $attribute_value, $prefix_len );
 				}
Original file line number	Diff line number	Diff line change
`@@ -543,7 +543,8 @@ function _inject_theme_attribute_in_template_part_block( &$block ) {`
`543`	`543`	`'core/template-part' === $block['blockName'] &&`
`544`	`544`	`! isset( $block['attrs']['theme'] )`
`545`	`545`	`) {`
`546`		`- $block['attrs']['theme'] = get_stylesheet();`
	`546`	`+ $attrs = $block['attrs'];`
	`547`	`+ $attrs['theme'] = get_stylesheet();`
`547`	`548`	`}`
`548`	`549`	`}`
`549`	`550`