How to get list of PlannerAssignment object from PlannerAssignments collection in Mirosoft Graph C# SDK

[23W]

When my C# app requests the Planner Task info from from tasks list of Planner Plan it receives collection of task objects (PlannerTask class).

Each object has Assignments properties of type PlannerAssignments. According to documentation this is collection of PlannerAssignment object stored in AdditionalData collection.

But in reality the PlannerAssignments.AdditionalData keeps collection of UntypedObject:

How to get list of PlannerAssignment not UntypedObject so as to correctly read assignment details?

[23W]

https://stackoverflow.com/questions/79662031/how-to-get-list-of-plannerassignment-object-from-plannerassignments-collection-i