Concurrency on JSON types - System.InvalidOperationException when reading JSON

System.InvalidOperationException
Cannot get the value of a token type 'Null' as a string.

at System.Text.Json.ThrowHelper.ThrowInvalidOperationException_ExpectedString(JsonTokenType tokenType)
at lambda_method2006(Closure, QueryContext, Object[], JsonReaderData)
at lambda_method2005(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)

public class Foo
{
public required Foo2 Foo2{ get; init; }
public required string Bar{ get; init; }
}

public class Foo2
{
...
}

builder.OwnsOne(m => m.Foo).ToJson().OwnsOne(foo=> foo.Foo2);

{..., "_TableSharingConcurrencyTokenConvention_RowVersion":null,"Foo2":{..., "_TableSharingConcurrencyTokenConvention_RowVersion":null}}