So I was tried to edit a Custom Field Type from Check to Select, but this thing resurface.
Delete the existing checkbox field first, update the customization, and then create the new Select field. This will work.
this is saved in data base with that configuration
Basically, we cannot change the field type after the field has been created because data is already stored in the database. If field type changes were allowed directly, someone might accidentally modify it and cause data loss, which would create problems.
thats why you have to delete the field and create again with select type
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Logical answer, thank you.