diff --git a/src/UnitOfWork.php b/src/UnitOfWork.php
index 4c55b72877..9e3a5beac1 100644
--- a/src/UnitOfWork.php
+++ b/src/UnitOfWork.php
@@ -637,6 +637,10 @@ public function computeChangeSet(ClassMetadata $class, object $entity): void
 
             foreach ($actualData as $propName => $actualValue) {
                 if (! isset($class->associationMappings[$propName])) {
+                    if (isset($class->fieldMappings[$propName]) && $class->fieldMappings[$propName]->notInsertable) {
+                        continue;
+                    }
+
                     $changeSet[$propName] = [null, $actualValue];
 
                     continue;
@@ -664,6 +668,10 @@ public function computeChangeSet(ClassMetadata $class, object $entity): void
 
                 $orgValue = $originalData[$propName];
 
+                if (isset($class->fieldMappings[$propName]) && $class->fieldMappings[$propName]->notUpdatable) {
+                    continue;
+                }
+
                 if (! empty($class->fieldMappings[$propName]->enumType)) {
                     if (is_array($orgValue)) {
                         foreach ($orgValue as $id => $val) {
@@ -1019,6 +1027,10 @@ public function recomputeSingleEntityChangeSet(ClassMetadata $class, object $ent
             }
 
             if ($orgValue !== $actualValue) {
+                if (isset($class->fieldMappings[$propName]) && $class->fieldMappings[$propName]->notUpdatable) {
+                    continue;
+                }
+
                 $changeSet[$propName] = [$orgValue, $actualValue];
             }
         }
diff --git a/tests/Tests/ORM/Functional/Ticket/GH12017Test.php b/tests/Tests/ORM/Functional/Ticket/GH12017Test.php
new file mode 100644
index 0000000000..0de0dd5c5f
--- /dev/null
+++ b/tests/Tests/ORM/Functional/Ticket/GH12017Test.php
@@ -0,0 +1,187 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use DateTimeImmutable;
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+class GH12017Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema([
+            GH12017EntityWithGeneratedFields::class,
+            GH12017EntityWithMixedFlags::class,
+        ]);
+    }
+
+    public function testGeneratedFieldsShouldNotBeDetectedAsChanges(): void
+    {
+        $entity       = new GH12017EntityWithGeneratedFields();
+        $entity->name = 'Test Entity';
+
+        $this->_em->persist($entity);
+        $this->_em->flush();
+
+        // Simulate database-generated values being fetched back via property accessors
+        // This mimics the behavior of assignDefaultVersionAndUpsertableValues()
+        $metadata = $this->_em->getClassMetadata(GH12017EntityWithGeneratedFields::class);
+        $metadata->setFieldValue($entity, 'generatedField', new DateTimeImmutable());
+        $metadata->setFieldValue($entity, 'computedField', 'computed-value-from-db');
+
+        $uow = $this->_em->getUnitOfWork();
+        $uow->computeChangeSets();
+
+        self::assertFalse(
+            $uow->isScheduledForUpdate($entity),
+            'Entity with only generated field changes should not be scheduled for update',
+        );
+
+        $changeSet = $uow->getEntityChangeSet($entity);
+        self::assertEmpty($changeSet, 'Changeset should not include generated fields');
+    }
+
+    public function testRecomputeSingleEntityChangeSetWithGeneratedFields(): void
+    {
+        $entity       = new GH12017EntityWithGeneratedFields();
+        $entity->name = 'Test Entity';
+
+        $this->_em->persist($entity);
+        $this->_em->flush();
+
+        // Simulate database-generated values being fetched back via property accessors
+        $metadata = $this->_em->getClassMetadata(GH12017EntityWithGeneratedFields::class);
+        $metadata->setFieldValue($entity, 'generatedField', new DateTimeImmutable());
+        $metadata->setFieldValue($entity, 'computedField', 'computed-value-from-db');
+
+        $uow   = $this->_em->getUnitOfWork();
+        $class = $this->_em->getClassMetadata(GH12017EntityWithGeneratedFields::class);
+        $uow->recomputeSingleEntityChangeSet($class, $entity);
+
+        self::assertFalse(
+            $uow->isScheduledForUpdate($entity),
+            'Entity should not be scheduled for update after recomputeSingleEntityChangeSet',
+        );
+
+        $changeSet = $uow->getEntityChangeSet($entity);
+        self::assertEmpty($changeSet, 'Changeset should be empty after recomputeSingleEntityChangeSet');
+    }
+
+    public function testNotInsertableFieldsShouldNotBeInChangesetForNewEntities(): void
+    {
+        $entity                 = new GH12017EntityWithGeneratedFields();
+        $entity->name           = 'Test Entity';
+        $entity->generatedField = new DateTimeImmutable();
+        $entity->computedField  = 'manually-set-value';
+
+        $this->_em->persist($entity);
+
+        $uow   = $this->_em->getUnitOfWork();
+        $class = $this->_em->getClassMetadata(GH12017EntityWithGeneratedFields::class);
+        $uow->computeChangeSet($class, $entity);
+
+        $changeSet = $uow->getEntityChangeSet($entity);
+
+        self::assertArrayHasKey('name', $changeSet, 'Name should be in changeset');
+        self::assertArrayNotHasKey('generatedField', $changeSet, 'Generated field should not be in changeset for new entity');
+        self::assertArrayNotHasKey('computedField', $changeSet, 'Computed field should not be in changeset for new entity');
+    }
+
+    public function testMixedInsertableUpdatableFlags(): void
+    {
+        $entity                            = new GH12017EntityWithMixedFlags();
+        $entity->name                      = 'Test Entity';
+        $entity->notInsertableButUpdatable = new DateTimeImmutable('2024-01-01 10:00:00');
+        $entity->insertableButNotUpdatable = new DateTimeImmutable('2024-01-01 11:00:00');
+
+        $this->_em->persist($entity);
+
+        $uow   = $this->_em->getUnitOfWork();
+        $class = $this->_em->getClassMetadata(GH12017EntityWithMixedFlags::class);
+        $uow->computeChangeSet($class, $entity);
+
+        $changeSet = $uow->getEntityChangeSet($entity);
+
+        self::assertArrayNotHasKey('notInsertableButUpdatable', $changeSet, 'Field with insertable:false should not be in changeset for new entity');
+        self::assertArrayHasKey('insertableButNotUpdatable', $changeSet, 'Field with insertable:true should be in changeset for new entity');
+
+        $this->_em->flush();
+
+        $entity->notInsertableButUpdatable = new DateTimeImmutable('2024-02-01 10:00:00');
+        $entity->insertableButNotUpdatable = new DateTimeImmutable('2024-02-01 11:00:00');
+
+        $uow->computeChangeSets();
+        $changeSet = $uow->getEntityChangeSet($entity);
+
+        self::assertArrayHasKey('notInsertableButUpdatable', $changeSet, 'Field with updatable:true should be in changeset for managed entity');
+        self::assertArrayNotHasKey('insertableButNotUpdatable', $changeSet, 'Field with updatable:false should not be in changeset for managed entity');
+    }
+}
+
+#[ORM\Entity]
+#[ORM\Table(name: 'gh12017_entity_with_generated_fields')]
+class GH12017EntityWithGeneratedFields
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column(type: 'integer')]
+    public int|null $id = null;
+
+    #[ORM\Column(type: 'string')]
+    public string|null $name = null;
+
+    #[ORM\Column(
+        name: 'generated_field',
+        type: 'datetime_immutable',
+        nullable: true,
+        insertable: false,
+        updatable: false,
+        generated: 'ALWAYS',
+    )]
+    public DateTimeImmutable|null $generatedField = null;
+
+    #[ORM\Column(
+        name: 'computed_field',
+        type: 'string',
+        nullable: true,
+        insertable: false,
+        updatable: false,
+        generated: 'ALWAYS',
+    )]
+    public string|null $computedField = null;
+}
+
+#[ORM\Entity]
+#[ORM\Table(name: 'gh12017_entity_with_mixed_flags')]
+class GH12017EntityWithMixedFlags
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column(type: 'integer')]
+    public int|null $id = null;
+
+    #[ORM\Column(type: 'string')]
+    public string|null $name = null;
+
+    #[ORM\Column(
+        name: 'not_insertable_but_updatable',
+        type: 'datetime_immutable',
+        nullable: true,
+        insertable: false,
+        updatable: true,
+    )]
+    public DateTimeImmutable|null $notInsertableButUpdatable = null;
+
+    #[ORM\Column(
+        name: 'insertable_but_not_updatable',
+        type: 'datetime_immutable',
+        insertable: true,
+        updatable: false,
+    )]
+    public DateTimeImmutable|null $insertableButNotUpdatable = null;
+}