Auto-Create terms for attribute field doesn’t split

I assigned a field from CSV to an attribute field and enabled “Is Taxonomy” and “Auto-Create Terms”. The values in CSV field are comma separated (Term 1, Term 2, Term 3, …).
However, the importer doesn’t split these terms by comma, for each product the whole string is used as new term.
I could use the taxonomy feature instead, but then this wouldn’t be a WooCommerce product attribute anymore, but become an unrelated generic taxonomy.

Thanks in advance!