When hiding a form field (setting it to "hidden" type), the prefill setting stays to "Enabled". If the user does not disable that setting, the field will not capture the values for the field on exiting, cookied, leads. The value from the database will prevail and the form will not work as intended.
And this happens!
So my recommendation is that, when a form field is set to hidden, the prefill setting should change to "Disabled" y default.
-Greg
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