设置ExcludingNestedObjects时导致ObjectDisposedException的FluentAssertions

我的EF模型定义如下:

public class ProgramManagerRolePermission
{
    [Key, Column(Order = 1)]
    public Guid ShardKey { get; set; }

    [Key, Column(Order = 2)]
    public Guid RoleId { get; set; }

    [Key, Column(Order = 3)]
    public Guid PermissionId { get; set; }

    [ForeignKey(nameof(RoleId))]
    public virtual ProgramManagerRole Role { get; set; }

    [ForeignKey(nameof(PermissionId))]
    public virtual ProgramManagerPermission Permission { get; set; }
}

using (var repo = IdentityProgramRepositoryFactory.Get())
{
    var role = repo.ProgramManagerRoles
        .Include(r => r.Permissions)
        .SingleOrDefault(r => r.Id == roleId);
    role.Permissions.Should().BeEquivalentTo(new[] {
        new Repo.ProgramManagerRolePermission
        {
            PermissionId = ProgramManagerPermissions.GrantOrRevokeRoles.Id,
            RoleId = roleId,
            ShardKey = identityProgramId
        },
        new Repo.ProgramManagerRolePermission
        {
            PermissionId = ProgramManagerPermissions.ManageNode.Id,
            RoleId = roleId,
            ShardKey = identityProgramId
        }
    }, options => options.ExcludingNestedObjects());
}

当我运行它时,测试失败,因为 ObjectDisposedException 与消息一起抛出:

如果我把最后一行改为:

}, options => options.Excluding(p => p.Role).Excluding(p => p.Permission));

然后测试成功运行。

Role 和 Permission . 当我显式地排除它们时,测试工作正常,当我告诉它排除所有嵌套对象时,它似乎仍在尝试在它们之间导航。

以前有人碰到过这个吗?为什么我认为应该发生的事情没有得到任何解释?