Alex Pott
--- a/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
+   *
+   * If drupal_register_shutdown_function() exists the commit will occur during
+   * shutdown so that it occurs at the latest possible moment.
+   *
+   * @param bool $shutdown
+   *   Internal param to denote that the method is being called by
+   *   _drupal_shutdown_function().
+   *
+   * @return void
+   *
+   * @internal
+   *   This method exists only to work around a bug caused by Drupal incorrectly
+   *   relying on object destruction order to commit transactions. Xdebug 3.3.0
+   *   changes the order of object destruction when the develop mode is enabled.
+   */
+  public static function commitAllOnShutdown(bool $shutdown = FALSE): void {
--- a/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificTransactionTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificTransactionTestBase.php
+    $manager = $testConnection->transactionManager();
+    $reflectionMethod = new \ReflectionMethod($manager, 'addStackItem');
+    $reflectionMethod->invoke($manager, 'bar', new StackItem('qux', StackItemType::Root));
+    // Ensure transaction state can be determined during object destruction.
+    // This is necessary for the test to pass when xdebug.mode has the 'develop'
+    // option enabled.
+    $reflectionProperty = new \ReflectionProperty(TransactionManagerBase::class, 'connectionTransactionState');
+    $reflectionProperty->setValue($manager, ClientConnectionTransactionState::Active);

    $this->expectException(\AssertionError::class);
    $this->expectExceptionMessageMatches("/^Transaction .stack was not empty\\. Active stack: bar\\\\qux/");
+    // Ensure that __destruct() results in an assertion error. Note that this
+    // will normally be called by PHP during the object's destruction but Drupal
+    // will commit all transactions when a database is closed thereby making
+    // this impossible to test unless it is called directly.
+    $manager->__destruct();