I have two forms, one in a language picker and the other is a longer form in their chosen language.
I have an optional hidden field I am using to store some codes. Sometimes it doesn’t always come through if that data is not available on the link. On the language picker, I have an on submit of

but when the referral code is not passed in, typeform substitutes “_____” in. My question is why is this desired behavior and is there any way to conditionally pass in the referral code in?
On submit, it moves to my second typeform but I get a url of typeform.com/to/XXXXXXX?referralcode=_____
I have a logic jump that asks if they were referred by anyone if the referral code is not in the hidden fields but that logic jump doesn’t work because everyone gets a referral code of “______”. How and why?