Fix for BC break in 2.6.2 when calling EM::find() with LockMode::OPTIMISTIC outside of a TX

lib/Doctrine/ORM/EntityManager.php

@@ -926,7 +926,7 @@ private function checkLockRequirements(int $lockMode, ClassMetadata $class): voi
                 if (!$class->isVersioned) {
                     throw OptimisticLockException::notVersioned($class->name);
                 }
-            // Intentional fallthrough
+                break;
             case LockMode::PESSIMISTIC_READ:
             case LockMode::PESSIMISTIC_WRITE:
                 if (!$this->getConnection()->isTransactionActive()) {

tests/Doctrine/Tests/ORM/Functional/Ticket/GH7366Test.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\DBAL\LockMode;
+use Doctrine\ORM\TransactionRequiredException;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+final class GH7366Test extends OrmFunctionalTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function setUp() : void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema(
+            [
+                GH7366Entity::class,
+            ]
+        );
+
+        $this->_em->persist(new GH7366Entity('baz'));
+        $this->_em->flush();
+        $this->_em->clear();
+    }
+
+    public function testOptimisticLockNoExceptionOnFind() : void
+    {
+        try {
+            $entity = $this->_em->find(GH7366Entity::class, 1, LockMode::OPTIMISTIC);
+        } catch (TransactionRequiredException $e) {
+            self::fail('EntityManager::find() threw TransactionRequiredException with LockMode::OPTIMISTIC');
+        }
+        self::assertEquals('baz', $entity->getName());
+    }
+}
+
+/**
+ * @Entity
+ */
+class GH7366Entity
+{
+    /**
+     * @Id
+     * @Column(type="integer")
+     * @GeneratedValue
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @Column(type="integer")
+     * @Version
+     */
+    protected $lockVersion = 1;
+
+    /**
+     * @Column(length=32)
+     * @var string
+     */
+    protected $name;
+
+
+    public function __construct(string $name)
+    {
+        $this->name = $name;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+}