[Blazor] Using IValidatableObject for form validation

EditItem.razor

<EditForm Model="@Item" OnValidSubmit="@(e => OnSave.InvokeAsync(Item))">
  <DataAnnotationsValidator />
  <ValidationSummary />

  <div class="form-group">
      <label for="Title">Name:</label>
      <InputText id="Title" @bind-Value="Item.name" class="form-control" />
  </div>

  <div class="form-group">
      <label for="Description">Description:</label>
      <InputText id="Description" @bind-Value="Item.Description" class="form-control" />
  </div>

  <div class="form-group">
      <InputCheckbox id="UseAlphaCode" @bind-Value="Item.UseAlphaCode" />
      <label for="UseAlphaCode">
          Use Alpha code
      </label>
  </div>

  <div class="form-group">
      <label for="AlphaCode">AlphaCode:</label>
      <InputText id="AlphaCode" @bind-Value="Item.AlphaCode" class="form-control" />
  </div>

  <div class="form-group">
      <label for="BetaCode">BetaCode:</label>
      <InputText id="BetaCode" @bind-Value="Item.BetaCode" class="form-control" />
  </div>

  <button type="submit" class="btn btn-primary">Save</button>
  <button type="button" class="btn btn-warning" @onclick="OnCancel">Cancel</button>
</EditForm>

@code {
    [Parameter]
    public Item Item { get; set; }

    [Parameter]
    public EventCallback<Item> OnSave { get; set; }

    [Parameter]
    public EventCallback OnCancel { get; set; }
}

Item.cs

public class Item : IValidatableObject, ICompany, IAddress
{
  [Required(ErrorMessage = "Name is required")]
  public string Name { get; set; }

  [Required(ErrorMessage = "Description is required")]
  public string Description { get; set; }

  public bool UseAlphaCode {get; set; }

  public string AlphaCode { get; set; }
  
  public string BetaCode { get; set; }

  [Range(0, 999.99)]
  public decimal Price { get; set; }
  
  public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
  {
      if (UseAlphaCode)
      {
          if (String.IsNullOrWhiteSpace(AlphaCode))
          {
              yield return new ValidationResult("AlphaCode is required", new[] { "AlphaCode" });
          }
      }
      else
      {
          if (String.IsNullOrWhiteSpace(BetaCode))
          {
              yield return new ValidationResult("BetaCode is required", new[] { "BetaCode" });
          }
      }
    }
  }

When using Blazor form validation with a model class that implement IValidatableObject, the overloaded Validate method is called only on form submit and only if no other validation decorated properties fails.
As an example, suppose that I try to submit the form with Name, Description and AlphaCode empty, and with UseAlphaCode equal to true. Then the validation summary will contain only errors for Name, Description and not for AlphaCode. Only after clearing the Name and Description errors then the AlphaCode appairs.