Change Details

Have a custom field with type=date defined and edit an existing task by adding a project tag.

Have a custom field with type=date defined in maniphest.custom-field-definitions and edit an existing Task changing something else, keeping that field as empty.

Have a custom field with type=date defined in maniphest.custom-field-definitions and edit an existing tTask by addchanging something a project tagelse, keeping that field as empty.