How exactly does EditContext.NotifyFieldChanged() work in Blazor WASM?

[marekm294]

I have this code (just part of it)

public class PhoneNumber
{
    public string Value { get; set; } = "";

    public string Prefix { get; set; } = "";
}

public class PhoneValidator : AbstractValidator<PhoneNumber>
{
    public PhoneValidator()
    {
        RuleFor(c => c.Value)
            .NotEmpty().WithMessage("Telefonní číslo je povinné");

        RuleFor(c => c.Prefix)
            .NotEmpty().WithMessage("Předvolba je povinná");

        RuleFor(c => c)
            .Must(c => c.IsValid()).WithMessage("Neplatné telefonní číslo");

    }
}

public abstract class ContactInputValidator<TContactInput> : AbstractValidator<TContactInput>
    where TContactInput : IContactInput
{
    public ContactInputValidator()
    {
        RuleFor(c => c.PhoneNumber)
            .SetValidator(new PhoneValidator());
    }
}

_phoneNumberFieldIdentifier = EditContext.Field(nameof(PhoneNumber));

EditContext?.NotifyFieldChanged(_phoneNumberFieldIdentifier.Value); (_phoneNumberFieldIdentifier.Value because it's nullable)

and when I execute tha last line of provided code ValidationMessage for PhoneNumber shows messages for all 3 rules in PhoneNumberValidator. Why? When I validate form, only the correct message is displayed and I need to the same behavior with NotifyFieldChanged. Is it possible?