Rolling out new update to comply with Atlassian's new GDPR policy. All new data created after this update would be in compliance with new GDPR.
For MIGRATION of existing data :-
Go to "Project settings" in each of the projects set up to use role based data, find the "Assignee (By Roles) GDPR Migration" and click the "Migrate" button.
FAILING TO DO SO WILL RESULT IN LOSS OF "ASSIGNEE (BY ROLES)" DATA AFTER 29 APRIL 2019.