MDVA-29148: ArrayBackend does not assign default value on save

The MDVA-29148 patch solves the issue where \Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend does not assign the default value on save. This patch is available when the Quality Patches Tool (QPT) 1.0.7 is installed. Please note that the issue was fixed in Adobe Commerce 2.4.2.

Affected products and versions

The patch is created for Adobe Commerce version:

Adobe Commerce on cloud infrastructure 2.3.3-p1.

Compatible with Adobe Commerce versions:

Adobe Commerce (all deployment methods) >=2.3.0 <2.4.2.

The patch might become applicable to other versions with new Quality Patches Tool releases. To check if the patch is compatible with your Adobe Commerce version, update the magento/quality-patches package to the latest version and check the compatibility on the Quality Patches Tool: Search for patches page. Use the patch ID as a search keyword to locate the patch.


When a product is created via an import script or the REST API, attributes that use the \Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend backend model and have a default value are not assigned the default value.

Steps to reproduce:

  1. Create a new global attribute that uses the \Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend backend model and a non-empty default value.
  2. Use the REST API to create a new product.
  3. Fetch that new product from the REST API and confirm that the attribute is not present in the product’s custom attributes.

Expected results:

The custom attribute default value was saved to the product attribute.

Actual results:

The custom attribute default value was not saved to the product attribute.

Apply the patch

To apply individual patches, use the following links depending on your deployment method:

To learn more about Quality Patches Tool, refer to:

For info about other patches available in QPT, refer to Patches available in QPT in our developer documentation.