OAuth 2.0 app stuck on classic scopes UI with no granular scopes tab available for Jira API

My OAuth 2.0 app was created before granular scopes rolled out, and the Jira API permissions page only shows the classic scopes list with no Classic/Granular tab switcher. I’ve tried unchecking all classic scopes and saving, but the granular scopes UI never appears. This is a live app with active users so creating a new app isn’t a viable option — looking for a way to unlock the granular scopes UI on an existing app, or for Atlassian to migrate it on the backend.