Erro de auto_return invalid. back_url.success must be defined na versão 2.5.0 do sdk no linux

[gutinha]

Estou com um problema quando atualizei a sdk da versão 2.4.1 para a versão 2.5.
Estou usando .net core 8 em um ambiente linux, ao rodar no windows, tudo roda normal. Porém no linux está dando esse erro ao tentar criar um pagamento.
Erro completo: Error response from API. | Status code: 400 | API message: auto_return invalid. back_url.success must be defined

Segue o meu método do controller
public async Task CreatePayment([FromBody] DonationViewModel model)
{

try
{
    MercadoPagoConfig.AccessToken = _configuration["MercadoPago:AccessToken"];

    // Criar a preferência primeiro
    var preference = new PreferenceRequest
    {
        Items = new List<PreferenceItemRequest>
{
    new PreferenceItemRequest
    {
        Title = "Doação",
        Quantity = 1,
        CurrencyId = "BRL",
        UnitPrice = model.Amount
    }
},
        PaymentMethods = new PreferencePaymentMethodsRequest
        {
            ExcludedPaymentTypes = new List<PreferencePaymentTypeRequest> {new PreferencePaymentTypeRequest
                {
                    Id = "ticket"
                }   
            },
            ExcludedPaymentMethods = new List<PreferencePaymentMethodRequest> { },          
            Installments = 12,
        },
        BackUrls = new PreferenceBackUrlsRequest
        {
            Success = Url.Action("Success", "Donate", null, Request.Scheme),
            Failure = Url.Action("Failure", "Donate", null, Request.Scheme),
            Pending = Url.Action("Pending", "Donate", null, Request.Scheme)
        },
        AutoReturn = "approved"
    };

    var client = new PreferenceClient();
    Preference preferenceResponse = await client.CreateAsync(preference);

    // Agora criar e salvar a doação com o PaymentId
    var donation = new PkmdDonations
    {
        Amount = model.Amount,
        PaymentMethod = model.PaymentMethod,
        Status = "pending",
        PaymentId = preferenceResponse.Id, // Agora temos o PaymentId
        CreatedAt = DateTime.UtcNow,
        PlayerAccount = (int)accountId
    };

    _context.PkmdDonations.Add(donation);
    await _context.SaveChangesAsync();

    // Atualizar a preferência com o external_reference
    preference.ExternalReference = donation.Id.ToString();
    preferenceResponse = await client.UpdateAsync(preferenceResponse.Id, preference);

    return Ok(new
    {
        success = true,
        preferenceId = preferenceResponse.Id,
        initPoint = preferenceResponse.InitPoint
    });
}
catch (Exception ex)
{
    return BadRequest(new { success = false, message = "Erro ao processar a doação: " + ex.Message });
}

}

[adgarboc]

I had the same problem in version 2.3.8

Error response from API. | Status code: 400 | API message: auto_return invalid. back_url.success must be defined

and this error is resolved by using "https" instead of "http" at least in the "success" URL. like the example on https://www.mercadopago.com.ar/developers/en/docs/checkout-pro/configure-back-urls#bookmark_define_return_url