Currently in v5, any permission changes I set via API are not reflected in permission cache until the current cached data expires.

group.getCachedData().invalidate();
for (User user :this.luckPermsApi.getUserManager().getLoadedUsers()) {
    user.getCachedData().invalidate();
}

To work around this issue in the past, I would force a cache invalidation on permission set as shown above but this does not work with v5.

Tested using LP 5.0.37

b2593d4