It added the unit test #6613

tests/Doctrine/Tests/Models/DDC6613/Phone.php

@@ -0,0 +1,27 @@
+<?php
+/**
+ *
+ * User: Uladzimir Struts <Sysaninster@gmail.com>
+ * Date: 11.08.2017
+ * Time: 13:12
+ */
+
+namespace Doctrine\Tests\Models\DDC6613;
+
+
+/**
+ * @Entity(readOnly=true)
+ * @Table(name="ddc6613_phone")
+ */
+
+class Phone
+{
+
+    /**
+     * @Id
+     * @GeneratedValue
+     * @Column(type="integer")
+     */
+    public $id;
+
+}

tests/Doctrine/Tests/Models/DDC6613/User.php

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+<?php
+/**
+ *
+ * User: Uladzimir Struts <Sysaninster@gmail.com>
+ * Date: 11.08.2017
+ * Time: 13:12
+ */
+
+namespace Doctrine\Tests\Models\DDC6613;
+
+
+use Doctrine\Common\Collections\ArrayCollection;
+
+/**
+ * @Entity()
+ * @Table(name="ddc6613_user")
+ */
+class User
+{
+
+    /**
+     * @Id
+     * @GeneratedValue
+     * @Column(type="integer")
+     */
+    public $id;
+
+
+    /**
+     * @ManyToMany(targetEntity="Phone", fetch="LAZY", cascade={"remove", "detach"})
+     */
+    public $phones;
+
+    /**
+     * User constructor.
+     */
+    public function __construct()
+    {
+        $this->phones = new ArrayCollection();
+    }
+
+
+}

tests/Doctrine/Tests/ORM/Functional/Ticket/DDC6613Test.php

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+<?php
+/**
+ *
+ * User: Uladzimir Struts <Sysaninster@gmail.com>
+ * Date: 11.08.2017
+ * Time: 12:28
+ */
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+
+use Doctrine\DBAL\Schema\SchemaException;
+use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\Mapping\Embeddable;
+use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\GeneratedValue;
+use Doctrine\ORM\Mapping\ManyToOne;
+use Doctrine\ORM\Proxy\Proxy;
+use Doctrine\Tests\Models\DDC6613\Phone;
+use Doctrine\Tests\Models\DDC6613\User;
+
+
+class DDC6613Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        try {
+            $this->setUpEntitySchema(
+                [
+                    Phone::class,
+                    User::class
+                ]
+            );
+        } catch (SchemaException $e) {
+        }
+    }
+
+    public function testFail()
+    {
+        $user = new User();
+        $user->id = 1;
+        $this->_em->persist($user);
+        $this->_em->flush();
+
+        $this->_em->clear();
+
+        /** @var User $user */
+        $user = $this->_em->find(User::class, 1);
+        $phone1 = new Phone();
+        $phone1->id = 1;
+        $user->phones->add($phone1);
+        $this->_em->persist($phone1);
+        $this->_em->flush();
+
+        $phone2 = new Phone();
+        $phone2->id = 2;
+        $user->phones->add($phone2);
+        $this->_em->persist($phone2);
+        $user->phones->toArray();
+        $this->_em->flush();
+    }
+
+}