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I totally changed the approach to what I was trying to achieve: possibility to manage product with sub-products, so customers may buy the whole product or some sub-products (if bought some...

It seems to me that there's a problem with checkbox attributes.

in functions_lookups.php

function zen_get_products_stock processes the $attributes variable passed as argument in this way:
...

Hello, problem here.

ZC 1.3.7 fresh (test installation with demo data)
Stock by Attributes 4.4

Admin config:

allow checkout false
show stock when low true