diff --git a/packages/block-library/src/navigation/deprecated.js b/packages/block-library/src/navigation/deprecated.js
index 64960ac6d37cab..7b570a4600881b 100644
--- a/packages/block-library/src/navigation/deprecated.js
+++ b/packages/block-library/src/navigation/deprecated.js
@@ -26,22 +26,23 @@ const migrateWithLayout = ( attributes ) => {
 		return attributes;
 	}
 
-	const { itemsJustification, orientation } = attributes;
-
-	const updatedAttributes = {
-		...attributes,
-	};
+	const {
+		itemsJustification,
+		orientation,
+		...updatedAttributes
+	} = attributes;
 
 	if ( itemsJustification || orientation ) {
 		Object.assign( updatedAttributes, {
 			layout: {
 				type: 'flex',
-				justifyContent: itemsJustification || 'left',
-				orientation: orientation || 'horizontal',
+				setCascadingProperties: 'true',
+				...( itemsJustification && {
+					justifyContent: itemsJustification,
+				} ),
+				...( orientation && { orientation } ),
 			},
 		} );
-		delete updatedAttributes.itemsJustification;
-		delete updatedAttributes.orientation;
 	}
 
 	return updatedAttributes;
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated-1.json b/test/integration/fixtures/blocks/core__navigation__deprecated-1.json
index fca0c7fb5d2a01..69a9ac1b8d44d1 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated-1.json
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated-1.json
@@ -9,7 +9,7 @@
 			"overlayMenu": "mobile",
 			"layout": {
 				"type": "flex",
-				"justifyContent": "left",
+				"setCascadingProperties": "true",
 				"orientation": "horizontal"
 			}
 		},
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated-1.serialized.html b/test/integration/fixtures/blocks/core__navigation__deprecated-1.serialized.html
index 15fcfd3733fe0e..be383041468002 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated-1.serialized.html
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated-1.serialized.html
@@ -1,3 +1,3 @@
-<!-- wp:navigation {"layout":{"type":"flex","justifyContent":"left","orientation":"horizontal"}} -->
+<!-- wp:navigation {"layout":{"type":"flex","setCascadingProperties":"true","orientation":"horizontal"}} -->
 <!-- wp:navigation-link {"label":"WordPress","url":"https://www.wordpress.org/"} /-->
 <!-- /wp:navigation -->
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated-v4.json b/test/integration/fixtures/blocks/core__navigation__deprecated-v4.json
index c35ba1a1f995c0..2796f5d9fe8fd2 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated-v4.json
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated-v4.json
@@ -10,7 +10,7 @@
 			"fontFamily": "cambria-georgia",
 			"layout": {
 				"type": "flex",
-				"justifyContent": "left",
+				"setCascadingProperties": "true",
 				"orientation": "horizontal"
 			}
 		},
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated-v4.serialized.html b/test/integration/fixtures/blocks/core__navigation__deprecated-v4.serialized.html
index fd5a89ce7ec166..85ecd3fd940242 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated-v4.serialized.html
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated-v4.serialized.html
@@ -1 +1 @@
-<!-- wp:navigation {"overlayMenu":"never","fontFamily":"cambria-georgia","layout":{"type":"flex","justifyContent":"left","orientation":"horizontal"}} /-->
+<!-- wp:navigation {"overlayMenu":"never","fontFamily":"cambria-georgia","layout":{"type":"flex","setCascadingProperties":"true","orientation":"horizontal"}} /-->
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated-v5.json b/test/integration/fixtures/blocks/core__navigation__deprecated-v5.json
index a7f66f17027c1b..b851644f32aedf 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated-v5.json
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated-v5.json
@@ -9,6 +9,7 @@
 			"overlayMenu": "never",
 			"layout": {
 				"type": "flex",
+				"setCascadingProperties": "true",
 				"justifyContent": "center",
 				"orientation": "vertical"
 			}
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated-v5.serialized.html b/test/integration/fixtures/blocks/core__navigation__deprecated-v5.serialized.html
index 688b6c199ed9df..8166dfb51a1be2 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated-v5.serialized.html
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated-v5.serialized.html
@@ -1 +1 @@
-<!-- wp:navigation {"overlayMenu":"never","layout":{"type":"flex","justifyContent":"center","orientation":"vertical"}} /-->
+<!-- wp:navigation {"overlayMenu":"never","layout":{"type":"flex","setCascadingProperties":"true","justifyContent":"center","orientation":"vertical"}} /-->
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated.json b/test/integration/fixtures/blocks/core__navigation__deprecated.json
index 7b4e691b4e2ce4..a9df1a99a149e7 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated.json
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated.json
@@ -15,7 +15,7 @@
 			},
 			"layout": {
 				"type": "flex",
-				"justifyContent": "left",
+				"setCascadingProperties": "true",
 				"orientation": "horizontal"
 			}
 		},
diff --git a/test/integration/fixtures/blocks/core__navigation__deprecated.serialized.html b/test/integration/fixtures/blocks/core__navigation__deprecated.serialized.html
index 2a0269ea2b58b1..e3a1a7ee035826 100644
--- a/test/integration/fixtures/blocks/core__navigation__deprecated.serialized.html
+++ b/test/integration/fixtures/blocks/core__navigation__deprecated.serialized.html
@@ -1,3 +1,3 @@
-<!-- wp:navigation {"style":{"typography":{"textTransform":"lowercase","textDecoration":"line-through","fontStyle":"italic","fontWeight":"100"}},"layout":{"type":"flex","justifyContent":"left","orientation":"horizontal"}} -->
+<!-- wp:navigation {"style":{"typography":{"textTransform":"lowercase","textDecoration":"line-through","fontStyle":"italic","fontWeight":"100"}},"layout":{"type":"flex","setCascadingProperties":"true","orientation":"horizontal"}} -->
 <!-- wp:navigation-link {"label":"WordPress","url":"https://www.wordpress.org/"} /-->
 <!-- /wp:navigation -->