Entity Framework 6 with Mysql Row not insert but table increase auto_increment

Question

i'm using EF6 to insert rows in database Mysql 8.0.26 . I've changed a column in table, after that I'm not update model in edmx . So when I try to add a new row and SaveChanges(), the save change go in error using a try and catch, but auto_increment of table increase. Someone know to understand how it can't increase auto_increment if the row can't insert : This is the example of code :

  Using e As New studio_laghezzaEntities4


            Try

                Dim newfasccons As New fasciconsulenza With {
                .Openbyuser = idUser,
                .FKcustomer = cons.CodiceCliente,
                .Opendate = Date.Now,
                .LastUpdateDate = Date.Now,
                .LastUserUpdate = idUser,
                .Praticacons = cons.CodiceFascicolo,
                .Esercente = fasc.Esercente
            }

                e.fasciconsulenza.Add(newfasccons)

                e.SaveChanges()

                Dim newcons As New consulenza With {
                .ProspettoOre = fasc.ProspettoOreLavoro,
                .NoteConsulenza = fasc.AreaDescrittiva,
                .FKuser = idUser,
                .FKfasc = newfasccons.IdDoc,
                .FKInterv = idtipointevento,
                .DataCreazione = Date.Now
            }

                e.consulenza.Add(newcons)

                e.SaveChanges()

                Dim newconsinassoc As New consofsales With {
                .FK_fasc = insertIddoc,
                .FK_oursales = idsaler
            }

                e.consofsales.Add(newconsinassoc)

                e.SaveChanges()

                
            Catch ex As Exception

                esito.inserito = False
                esito.message = ex.Message

            End Try
  End Using