When you remove a custom field from a issue type, does it remove the field from all existing tickets? That is, the data that had been entered in that field is just lost forever? We accidentally had the wrong field on a ticket (two student ID fields with very similar names - one required and one not required) so we took the required field off of the ticket and put the optional field on. Now none of the existing tickets have a student id - they were all replaced with an empty field.

Is that working as intended? Or a bug?