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I think one of the reasons is that, because we consider hidden fields as not required and shouldn't be filled.
In the form, you have the option in the preferences to disable/enable "Clear a field on hide", but this is only applicable in the form view. So, even if this option is disabled, the values in the hidden fields are automatically deleted when submit button is clicked, no data is captured.
Can I request to capture data even if the field is hidden?
JotForm Support Manager
If you want to capture a data then you must make the field visible. There is no other way around. Usually hidden fields are used for internal purposes, when editing the submission for approval or so is required.
Please let us know what would be the scenario so we can understand better what you need to accomplish.