diff --git a/packages/block-editor/src/components/global-styles/test/use-global-styles-output.js b/packages/block-editor/src/components/global-styles/test/use-global-styles-output.js
index 2edef1b38b11b..1848906ed1fcd 100644
--- a/packages/block-editor/src/components/global-styles/test/use-global-styles-output.js
+++ b/packages/block-editor/src/components/global-styles/test/use-global-styles-output.js
@@ -644,7 +644,7 @@ describe( 'global styles renderer', () => {
 			} );
 
 			expect( layoutStyles ).toEqual(
-				'.wp-block-group.is-layout-flow > * { margin-block-start: 0; margin-block-end: 0; }.wp-block-group.is-layout-flow > * + * { margin-block-start: 12px; margin-block-end: 0; }.wp-block-group.is-layout-flex { gap: 12px; }'
+				'.wp-block-group-is-layout-flow.wp-block-group-is-layout-flow > * { margin-block-start: 0; margin-block-end: 0; }.wp-block-group-is-layout-flow.wp-block-group-is-layout-flow > * + * { margin-block-start: 12px; margin-block-end: 0; }.wp-block-group-is-layout-flex.wp-block-group-is-layout-flex { gap: 12px; }'
 			);
 		} );
 
diff --git a/phpunit/block-supports/layout-test.php b/phpunit/block-supports/layout-test.php
index 7ec06401c0170..c29899e3f4d1b 100644
--- a/phpunit/block-supports/layout-test.php
+++ b/phpunit/block-supports/layout-test.php
@@ -420,7 +420,7 @@ public function data_layout_support_flag_renders_classnames_on_wrapper() {
 						),
 					),
 				),
-				'expected_output' => '<div class="wp-block-group is-layout-flow"></div>',
+				'expected_output' => '<div class="wp-block-group is-layout-flow wp-block-group-is-layout-flow"></div>',
 			),
 			'single wrapper block layout with constrained type' => array(
 				'args'            => array(
@@ -439,7 +439,7 @@ public function data_layout_support_flag_renders_classnames_on_wrapper() {
 						),
 					),
 				),
-				'expected_output' => '<div class="wp-block-group is-layout-constrained"></div>',
+				'expected_output' => '<div class="wp-block-group is-layout-constrained wp-block-group-is-layout-constrained"></div>',
 			),
 			'multiple wrapper block layout with flow type' => array(
 				'args'            => array(
@@ -460,7 +460,7 @@ public function data_layout_support_flag_renders_classnames_on_wrapper() {
 						),
 					),
 				),
-				'expected_output' => '<div class="wp-block-group"><div class="wp-block-group__inner-wrapper is-layout-flow"></div></div>',
+				'expected_output' => '<div class="wp-block-group"><div class="wp-block-group__inner-wrapper is-layout-flow wp-block-group-is-layout-flow"></div></div>',
 			),
 		);
 	}
diff --git a/phpunit/class-wp-theme-json-test.php b/phpunit/class-wp-theme-json-test.php
index 742c2d948b451..b46838c0275b1 100644
--- a/phpunit/class-wp-theme-json-test.php
+++ b/phpunit/class-wp-theme-json-test.php
@@ -119,7 +119,7 @@ public function test_get_stylesheet_generates_valid_block_gap_values_and_skips_n
 		);
 
 		$this->assertEquals(
-			'body { margin: 0;}.wp-site-blocks > .alignleft { float: left; margin-right: 2em; }.wp-site-blocks > .alignright { float: right; margin-left: 2em; }.wp-site-blocks > .aligncenter { justify-content: center; margin-left: auto; margin-right: auto; }.wp-site-blocks > * { margin-block-start: 0; margin-block-end: 0; }.wp-site-blocks > * + * { margin-block-start: 1rem; }body { --wp--style--block-gap: 1rem; }body .is-layout-flow > *{margin-block-start: 0;margin-block-end: 0;}body .is-layout-flow > * + *{margin-block-start: 1rem;margin-block-end: 0;}body .is-layout-flex{gap: 1rem;}body .is-layout-flow > .alignleft{float: left;margin-inline-start: 0;margin-inline-end: 2em;}body .is-layout-flow > .alignright{float: right;margin-inline-start: 2em;margin-inline-end: 0;}body .is-layout-flow > .aligncenter{margin-left: auto !important;margin-right: auto !important;}body .is-layout-flex{display: flex;}body .is-layout-flex{flex-wrap: wrap;align-items: center;}.wp-block-post-content{color: gray;}.wp-block-social-links.is-layout-flow > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-social-links.is-layout-flow > * + *{margin-block-start: 0;margin-block-end: 0;}.wp-block-social-links.is-layout-flex{gap: 0;}.wp-block-buttons.is-layout-flow > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-buttons.is-layout-flow > * + *{margin-block-start: 0;margin-block-end: 0;}.wp-block-buttons.is-layout-flex{gap: 0;}',
+			'body { margin: 0;}.wp-site-blocks > .alignleft { float: left; margin-right: 2em; }.wp-site-blocks > .alignright { float: right; margin-left: 2em; }.wp-site-blocks > .aligncenter { justify-content: center; margin-left: auto; margin-right: auto; }.wp-site-blocks > * { margin-block-start: 0; margin-block-end: 0; }.wp-site-blocks > * + * { margin-block-start: 1rem; }body { --wp--style--block-gap: 1rem; }body .is-layout-flow > *{margin-block-start: 0;margin-block-end: 0;}body .is-layout-flow > * + *{margin-block-start: 1rem;margin-block-end: 0;}body .is-layout-flex{gap: 1rem;}body .is-layout-flow > .alignleft{float: left;margin-inline-start: 0;margin-inline-end: 2em;}body .is-layout-flow > .alignright{float: right;margin-inline-start: 2em;margin-inline-end: 0;}body .is-layout-flow > .aligncenter{margin-left: auto !important;margin-right: auto !important;}body .is-layout-flex{display: flex;}body .is-layout-flex{flex-wrap: wrap;align-items: center;}.wp-block-post-content{color: gray;}.wp-block-social-links-is-layout-flow.wp-block-social-links-is-layout-flow > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-social-links-is-layout-flow.wp-block-social-links-is-layout-flow > * + *{margin-block-start: 0;margin-block-end: 0;}.wp-block-social-links-is-layout-flex.wp-block-social-links-is-layout-flex{gap: 0;}.wp-block-buttons-is-layout-flow.wp-block-buttons-is-layout-flow > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-buttons-is-layout-flow.wp-block-buttons-is-layout-flow > * + *{margin-block-start: 0;margin-block-end: 0;}.wp-block-buttons-is-layout-flex.wp-block-buttons-is-layout-flex{gap: 0;}',
 			$theme_json->get_stylesheet()
 		);
 	}