Link field cannot be used in custom doctype web form

Hey guys,
I created a webform using a custom doctype. Inside this custom doctype there is a link field to the Event doctype.

Inside the webform a guest cannot select pre-existing events but if you enter into the actual event you can use the link field inside a child form.

Is this a permission level issue ? I’ve modified permissions to all potential ways I could imagine.

Thank you in advance.