diff --git a/backport-changelog/6.8/7069.md b/backport-changelog/6.8/7069.md
index 3e734637ddbb2..69edbde58902d 100644
--- a/backport-changelog/6.8/7069.md
+++ b/backport-changelog/6.8/7069.md
@@ -3,4 +3,3 @@ https://github.com/WordPress/wordpress-develop/pull/7069
 * https://github.com/WordPress/gutenberg/pull/63401
 * https://github.com/WordPress/gutenberg/pull/66918
 * https://github.com/WordPress/gutenberg/pull/67018
-* https://github.com/WordPress/gutenberg/pull/67552
diff --git a/lib/compat/wordpress-6.8/blocks.php b/lib/compat/wordpress-6.8/blocks.php
index dc8747c04aec2..ba321b7ac987a 100644
--- a/lib/compat/wordpress-6.8/blocks.php
+++ b/lib/compat/wordpress-6.8/blocks.php
@@ -71,10 +71,6 @@ function gutenberg_stabilize_experimental_block_supports( $args ) {
 		}
 
 		$stabilize_config = function ( $unstable_config, $stable_support_key ) use ( $experimental_support_properties, $common_experimental_properties ) {
-			if ( ! is_array( $unstable_config ) ) {
-				return $unstable_config;
-			}
-
 			$stable_config = array();
 			foreach ( $unstable_config as $key => $value ) {
 				// Get stable key from support-specific map, common properties map, or keep original.
@@ -120,19 +116,18 @@ function gutenberg_stabilize_experimental_block_supports( $args ) {
 				( $key_positions[ $support ] ?? PHP_INT_MAX ) <
 				( $key_positions[ $stable_support_key ] ?? PHP_INT_MAX );
 
-			/*
-			 * To merge the alternative support config effectively, it also needs to be
-			 * stabilized before merging to keep stabilized and experimental flags in
-			 * sync.
-			 */
-			$args['supports'][ $stable_support_key ] = $stabilize_config( $args['supports'][ $stable_support_key ], $stable_support_key );
-			// Prevents reprocessing this support as it was stabilized above.
-			$done[ $stable_support_key ] = true;
-
-			if ( is_array( $stable_config ) && is_array( $args['supports'][ $stable_support_key ] ) ) {
-				$stable_config = $experimental_first
+			if ( is_array( $args['supports'][ $stable_support_key ] ) ) {
+				/*
+				 * To merge the alternative support config effectively, it also needs to be
+				 * stabilized before merging to keep stabilized and experimental flags in
+				 * sync.
+				 */
+				$args['supports'][ $stable_support_key ] = $stabilize_config( $args['supports'][ $stable_support_key ], $stable_support_key );
+				$stable_config                           = $experimental_first
 					? array_merge( $stable_config, $args['supports'][ $stable_support_key ] )
 					: array_merge( $args['supports'][ $stable_support_key ], $stable_config );
+				// Prevents reprocessing this support as it was merged above.
+				$done[ $stable_support_key ] = true;
 			} else {
 				$stable_config = $experimental_first
 					? $args['supports'][ $stable_support_key ]
diff --git a/phpunit/block-supports/border-test.php b/phpunit/block-supports/border-test.php
index 510633b48aab5..6ec43b369d9a2 100644
--- a/phpunit/block-supports/border-test.php
+++ b/phpunit/block-supports/border-test.php
@@ -730,104 +730,4 @@ public function test_should_stabilize_border_supports_using_order_based_merge()
 		);
 		$this->assertSame( $expected, $actual, 'Merged stabilized border block support config does not match when stable keys are first.' );
 	}
-
-	/**
-	 * Tests that boolean border support configurations are handled correctly.
-	 *
-	 * @dataProvider data_boolean_border_supports
-	 *
-	 * @param array         $supports       The supports configuration to test.
-	 * @param boolean|array $expected_value The expected final border support value.
-	 */
-	public function test_should_handle_boolean_border_supports( $supports, $expected_value ) {
-		$args = array(
-			'supports' => $supports,
-		);
-
-		$actual = gutenberg_stabilize_experimental_block_supports( $args );
-
-		$this->assertSame( $expected_value, $actual['supports']['border'] );
-	}
-
-	/**
-	 * Data provider for boolean border support tests.
-	 *
-	 * @return array Test parameters.
-	 */
-	public function data_boolean_border_supports() {
-		return array(
-			'experimental true only'                   => array(
-				array(
-					'__experimentalBorder' => true,
-				),
-				true,
-			),
-			'experimental false only'                  => array(
-				array(
-					'__experimentalBorder' => false,
-				),
-				false,
-			),
-			'experimental true before stable false'    => array(
-				array(
-					'__experimentalBorder' => true,
-					'border'               => false,
-				),
-				false,
-			),
-			'stable true before experimental false'    => array(
-				array(
-					'border'               => true,
-					'__experimentalBorder' => false,
-				),
-				false,
-			),
-			'experimental array before stable boolean' => array(
-				array(
-					'__experimentalBorder' => array(
-						'color' => true,
-						'width' => true,
-					),
-					'border'               => false,
-				),
-				false,
-			),
-			'stable array before experimental boolean' => array(
-				array(
-					'border'               => array(
-						'color' => true,
-						'width' => true,
-					),
-					'__experimentalBorder' => true,
-				),
-				true,
-			),
-			'experimental boolean before stable array' => array(
-				array(
-					'__experimentalBorder' => true,
-					'border'               => array(
-						'color' => true,
-						'width' => true,
-					),
-				),
-				array(
-					'color' => true,
-					'width' => true,
-				),
-			),
-			'stable boolean before experimental array' => array(
-				array(
-					'border'               => false,
-					'__experimentalBorder' => array(
-						'color' => true,
-						'width' => true,
-					),
-				),
-				array(
-					'color' => true,
-					'width' => true,
-				),
-			),
-		);
-	}
 }