address for invoice is requested also for free subscriptions

I have "use invoice" setting activated in emerald general settings

when I test as a normal user and I try to activate a free sunbscription in frontend emerald ask me for the billing address, saying that it's mandatory

I take a look atr the subscription settings but I can't find a setting to disable this on the subscription level

I think it makes sense to not ask for billing address or create an invoice if the subscription is free

could you add this by default?

thank you