[CosmosDB] - EFCore is failing to save when same object is assigned to entity properties twice

[Karthigeyan73]

I am trying to save an entity by assigning same objects to two properties, but it fails to save and throws error.
Database: Azure CosmosDB

With the below code, I am not able to save:

    Order order = new Order() { id = Guid.NewGuid().ToString(), Description = "Order#1" };
    Product product = new Product() { SKU = "one", Description = "this is product one" };

    order.Product1 = product;
    order.Product2 = product;

stack traces

System.InvalidOperationException: Unable to track an entity of type 'Order.Product2#Product' because its primary key property 'Orderid' is null.
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.NullableKeyIdentityMap`1.Add(InternalEntityEntry entry)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.StartTracking(InternalEntityEntry entry)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityState(EntityState oldState, EntityState newState, Boolean acceptChanges, Boolean modifyProperties)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.InternalEntityEntry.SetEntityState(EntityState entityState, Boolean acceptChanges, Boolean modifyProperties, Nullable`1 forceStateWhenUnknownKey)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.PaintAction(EntityEntryGraphNode`1 node)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph[TState](EntityEntryGraphNode`1 node, Func`2 handleNode)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityEntryGraphIterator.TraverseGraph[TState](EntityEntryGraphNode`1 node, Func`2 handleNode)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.EntityGraphAttacher.AttachGraph(InternalEntityEntry rootEntry, EntityState targetState, EntityState storeGeneratedWithKeySetTargetState, Boolean forceStateWhenUnknownKey)
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.SetEntityState(InternalEntityEntry entry, EntityState entityState)
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.Add(TEntity entity)
   at CosmosDbApi.Controllers.OrdersController.PostOrder(Order order1) in D:\Learnings\Cosmos DB\CosmosClient\CosmosDbApi\Controllers\OrdersController.cs:line 99

With the below code, I am able to save:

    Order order = new Order() { id = Guid.NewGuid().ToString(), Description = "Order#1" };
    Product product1 = new Product() { SKU = "one", Description = "this is product one" };
    Product product2 = new Product() { SKU = "one", Description = "this is product one" };

    order.Product1 = product1;
    order.Product2 = product2;

EF Core version:
Database provider: Microsoft.EntityFrameworkCore.Cosmos
Target framework: .NET 6.0
Operating system: Windows 10
IDE: Visual Studio 2022

[ajcvickers]

Duplicate of #12345