My functional tests use Microsoft.EntityFrameworkCore.InMemory version 7.0.20.
When I run the functional tests for any entity that has a dateonly field I get the error.

{"Expression of type 'System.Nullable`1[System.DateOnly]' cannot be used for parameter of type 'System.DateTime' of method 'System.DateOnly FromDateTime(System.DateTime)' (Parameter 'arg0')"}

I use the dateonly converter

public class DateOnlyConverter : ValueConverter<DateOnly, DateTime>
{
  /// <summary>
  /// Creates a new instance of this converter.
  /// </summary>
  public DateOnlyConverter() : base(
    d => d.ToDateTime(TimeOnly.MinValue),
    d => DateOnly.FromDateTime(d))
  { }
}

The entity configuration

  public void Configure(EntityTypeBuilder<Payback> builder)
{
    builder.ToTable("Paybacks").HasKey(k => k.Id);

//other Properties

    builder
      .OwnsOne(p => p.CurrentPaybackSchedule, s =>
      {
        s.WithOwner();
        s.Property(s => s.ScheduleDate).HasConversion<DateOnlyConverter>().HasColumnName(nameof(Payback.CurrentPaybackSchedule.ScheduleDate));
        s.HasIndex(p => p.ScheduleDate);
      });
}

I am not sure why the in memory database is pulling the field as a dateonly.

I have checked the versioning of all my ef packages and they all seem to be at 7.0.20.

When I run the query outside of the functional tests the code works.