Question:
The attributes are duplicated 3 times each time export
Answer:
In this case, could you please create a new Bss_BssProductAttributesCustomize module to customize function export() of file: app/code/Bss/ProductAttributesImportExport/Model/Export/ProductAttributes.php
For more information about product, please refer Import/Export Product Attributes for Magento 2 page.
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