Match expected functionality

Author: borkweb

src/Arrays/Arr.php

@@ -1438,11 +1438,15 @@ public static function intersect_key_recursive( array $array, array ...$arrays )
 
 			$arrays_to_intersect = [];
 			foreach ( $arrays as $intersect_array ) {
-				if ( ! isset( $intersect_array[ $key ] ) || ! is_array( $intersect_array[ $key ] ) ) {
+				if ( ! isset( $intersect_array[ $key ] ) ) {
 					unset( $array[ $key ] );
 					continue 2;
 				}
 
+				if ( ! is_array( $intersect_array[ $key ] ) ) {
+					continue;
+				}
+
 				$arrays_to_intersect[] = $intersect_array[ $key ];
 			}
 

tests/wpunit/IntersectKeyRecursiveTest.php

@@ -248,6 +248,10 @@ public function test_with_multiple_arrays(): void {
 					'a' => 1,
 					'b' => 2,
 				],
+				'z' => [
+					'a' => 1,
+					'b' => 2,
+				],
 			],
 		], $result );
 	}