Required owned entity on a TPH derived type is materialized for an unrelated row

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@AndriySvyryd ci sta già lavorando.

Dal 17/7/2026.

Valutazione

Questa issue non è ancora stata valutata.

Descrizione

area-owned-entities area-query customer-reported
Bug description

Using TPH, a derived type has a required OwnsOne navigation:

efcore-tph-required-owned-repro.zip

modelBuilder.Entity<CircleOverlay>(builder =>
{
    builder.OwnsOne(x => x.Shape);
    builder.Navigation(x => x.Shape).IsRequired();
});

The database contains only a LineOverlay and no CircleOverlay rows. However,
querying the base type still invokes the Circle constructor with null:

await db.Overlays.AsNoTracking().ToListAsync();

CircleOverlay rows in database: 0
Circle constructor called: point is null = True, radius = 0
System.ArgumentNullException: Value cannot be null. (Parameter 'point')

Expected

EF materializes the LineOverlay without invoking the Circle constructor,
because the row discriminator is LineOverlay.

Reproduction

Run the attached project:

dotnet run

Reproduced with:

  • EF Core / SQLite provider 10.0.10
  • .NET 10.0

This appears related to #31353, which was fixed in 8.0.3. Unlike that issue,
this owned navigation is explicitly configured as required. Making it optional
avoids the exception, but changes the model semantics: every CircleOverlay
must have a Circle.

Your code
A complete minimal runnable reproduction project is attached:

[EfCoreTphRequiredOwnedRepro.zip](replace-with-the-link-generated-by-GitHub)

Run it with:


dotnet run
Stack traces
Materializing the base TPH query...
Circle constructor called: point is null = True, radius = 0
Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'point')
   at System.ArgumentNullException.Throw(String paramName)
   at System.ArgumentNullException.ThrowIfNull(Object argument, String paramName)
   at Circle..ctor(String point, Double radius) in C:\myfiles\mytemp\projects\efcore-tph-required-owned-repro\Program.cs:line 62
   at lambda_method84(Closure, QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator)
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at Program.<Main>$(String[] args) in C:\myfiles\mytemp\projects\efcore-tph-required-owned-repro\Program.cs:line 32
Verbose output
EF Core version

10.0.10

Database provider

Microsoft.EntityFrameworkCore.Sqlite

Target framework

.NET 10

Operating system

No response

IDE

No response

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