Unable to save product, post error 504

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Describe the bug

When we update the products only with combinations, post request show error 504
When turn on dev mode result in green success message confirmation but products are not updated after a refresh we cant see the modification in any fields

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to 'product with combinations'
2. Click on 'save'

Additional information

PrestaShop version: 1.7.4.4

PHP version: 7.1

 

can anyone help me please?