Computed primary key doesn't get updated in EF Core entity after insert

I have a special case where the Id of the table is defined as a computed column like this:

CREATE TABLE [BusinessArea](
    [Id]  AS (isnull((CONVERT([nvarchar],[CasaId],(0))+'-')+CONVERT([nvarchar],[ConfigurationId],(0)),'-')) PERSISTED NOT NULL,
    [CasaId] [int] NOT NULL,
    [ConfigurationId] [int] NOT NULL,
    [Code] [nvarchar](4) NOT NULL,
    [Name] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_BusinessArea] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
) ON [PRIMARY]
GO

Usually when I have a computed column i configure it like this:

builder.Entity<MyEntity>()
 .Property(p => p.MyComputed).HasComputedColumnSql(null);

With .HasComputedColumnSql() the value of MyComputed is reflected an insert/update on the entity.

However this trick doesn't work if the computed column is a PK.

Any idea on how to make that work also with a PK?