Prepare source line task/asset landing page is not restricting data as per value set security

Summary: We have created location flexfield value set security based on country and assigned the respective roles to the users.

For example, if a user is provided FA USA role, they can only see USA country both in the dropdown in UI for all purposes and Add Asset ADFDi. Thus, they cannot add any asset or transfer etc to any location which is not US. Also, they are unable to inquire assets not in their country.

The problem is that Prepare source lines is not getting restricted in this case. A user with USA access is able to see all lines across all locations.