I created a team-managed project in Jira Software Cloud, using csv importer, including custom fields.
All fields display descriptions inherited the time of the csv import issue creation '(Migrated on 22 Mar 2024 06:13 UTC)'.
I went to Project settings / Issue types and updated the display descriptions for each field, e.g. field name 'Source':

However, on existing and new issues, the 'Migrated on...' description still displays:


Any guidance on how to get the display description to update would be much appreciated!
Thanks,
Dan.