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After migrating Magento 1 products to Magento 2 I get this error in backend when opening products:

{"0":"Class eav/entity_attribute_backend_array does not exist","1":"#1 Magento\Framework\Code\Reader\ClassReader->getConstructor() called at [vendor/magento/framework/ObjectManager/Definition/Runtime.php:49]\n#2 Magento\Framework\ObjectManager\Definition\Runtime->getParameters() ... /","script_name":"/index.php"}

Before importing products I have imported categories and attributes. Magento 1.9.3. -> Magento 2.3.2

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The Magento Data Migration tool does not handle all possible eav_attribute rows cleanly by default.

I suspect that your M1 data base includes rows in eav_attribute that have a backend_model value of "eav/entity_attribute_backend_array". These may have been migrated as-is to M2. If so, they will need to be updated to "Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend".

In general, all values in M1 eav_attribute.source_model and eav_attribute.backend_model should be reviewed and updated as necessary to the equivalent M2 classes.

It is possible to customize the Data Migration tool, but it may not be worth it for a few cases that can be easily resolved by updating the database.

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You have to run below query for identifying that attribute

SELECT * FROM eav_attribute WHERE backend_model = 'eav/entity_attribute_backend_array'

You have to change backend_model this attribute from database .

Replace With This:-

 Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend

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