EF 7.0.0 TPH migration fails with System.InvalidOperationException

[editim]

Why is migration failing?

Hi.
Had existing project on .net6/ef6.
Upgraded project to .net7/ef7.
Added new task type with migration and newly generated migration is failing.
See, example repo.

Any ideas how to fix this?
Thanks

Code

Repo with the issue example https://github.com/editim/dotnet-ef-tbh-test

using Microsoft.EntityFrameworkCore;

using (var dbContext = new MyDbContext())
{
    dbContext.Database.EnsureDeleted();
    //dbContext.Database.EnsureCreated();
    dbContext.Database.Migrate();

    var taskA = new TaskA { Name = "Task A", RandomProp = 123, TaskAProp = 2 };
    var taskB = new TaskB { Name = "Task B", RandomProp = 424, TaskBProp = 415 };
    var taskC = new TaskC { Name = "Task C", RandomProp = 3, RandomProp2= 535, TaskCProp = 415 };

    dbContext.Tasks.Add(taskA);
    dbContext.Tasks.Add(taskB);
    dbContext.Tasks.Add(taskC);

    dbContext.SaveChanges();

    var list = dbContext.Tasks.ToList();
}



public class MyDbContext : DbContext
{
    public DbSet<TaskBase> Tasks { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<TaskBase>()
            .HasDiscriminator<string>("task_type")
            .HasValue<TaskA>("a")
            .HasValue<TaskB>("b")
            .HasValue<TaskC>("c");

        base.OnModelCreating(modelBuilder);
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=TBH_test;MultipleActiveResultSets=true;Integrated Security=True;Encrypt=False;");

        base.OnConfiguring(optionsBuilder);
    }
}


public abstract class TaskBase
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class TaskA : TaskBase
{
    public int RandomProp { get; set; }
    public int TaskAProp { get; set; }
}

public class TaskB : TaskBase
{
    public int RandomProp { get; set; }
    public int TaskBProp { get; set; }
}

public class TaskC : TaskBase
{
    public int RandomProp { get; set; }
    public int RandomProp2 { get; set; }
    public int TaskCProp { get; set; }
}

Error

PS C:\repos\github\dotnet-ef-tbh-test\TestApp> dotnet ef database update
Build started...
Build succeeded.
Applying migration '20221130081757_Init'.
Applying migration '20221130083118_AddTaskC'.
System.InvalidOperationException: Table name must be specified to configure a table-specific property mapping.
   at Microsoft.EntityFrameworkCore.Metadata.Builders.TableBuilder.GetStoreObjectIdentifier()
   at Microsoft.EntityFrameworkCore.Metadata.Builders.TableBuilder.Property(String propertyName)
   at TestApp.Migrations.AddTaskC.<>c.<BuildTargetModel>b__2_4(TableBuilder t) in C:\repos\github\dotnet-ef-tbh-test\TestApp\Migrations\20221130083118_AddTaskC.Designer.cs:line 63
   at Microsoft.EntityFrameworkCore.RelationalEntityTypeBuilderExtensions.ToTable(EntityTypeBuilder entityTypeBuilder, Action`1 buildAction)
   at TestApp.Migrations.AddTaskC.<>c.<BuildTargetModel>b__2_1(EntityTypeBuilder b) in C:\repos\github\dotnet-ef-tbh-test\TestApp\Migrations\20221130083118_AddTaskC.Designer.cs:line 61
   at Microsoft.EntityFrameworkCore.ModelBuilder.Entity(String name, Action`1 buildAction)
   at TestApp.Migrations.AddTaskC.BuildTargetModel(ModelBuilder modelBuilder) in C:\repos\github\dotnet-ef-tbh-test\TestApp\Migrations\20221130083118_AddTaskC.Designer.cs:line 51
   at Microsoft.EntityFrameworkCore.Migrations.Migration.<get_TargetModel>g__Create|5_0()
   at Microsoft.EntityFrameworkCore.Migrations.Migration.get_TargetModel()
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.GenerateUpSql(Migration migration, MigrationsSqlGenerationOptions options)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.<>c__DisplayClass16_2.<GetMigrationCommandLists>b__2()
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
   at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String connectionString, String contextType)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String connectionString, String contextType)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Table name must be specified to configure a table-specific property mapping.

Include provider and version information

EF Core version: 6.0.0
Database provider: (e.g. Microsoft.EntityFrameworkCore.SqlServer)
Target framework: (e.g. .NET 6.0)
Operating system:
IDE: (e.g. Visual Studio 2022 17.4)

EF Core version: 7.0.0
Database provider: (e.g. Microsoft.EntityFrameworkCore.SqlServer)
Target framework: (e.g. .NET 7.0)
Operating system:
IDE: (e.g. Visual Studio 2022 17.4)

[roji]

Duplicate of #29534

[editim]

Got it.
Downgraded to previous EF version for now.

[MarounMaroun]

@editim Downgrading to older EF will eventually require a downgrade for .NET Core, no?