Color function in vistime() not working

General
1

In vistime(), the function col.color does not assign the same colour for the same party. In the reprex below, I have four observations with political party PJ, but they assume different colours.

Can you help me with this? I would like to have different observations/presidents, but with the same colour, indicating that the party continuity.

My code:

timeline <- vistime(crono,
        col.event = "Presidente",
        col.start = "Inicio",
        col.end = "Fim",
        col.group = "Pais",
        col.color = "Partido",
        title = "Cronología de los presidentes en los Estados Parte del Mercosur",
        optimize_y = FALSE, linewidth = 20)

crono<-data.frame(
  stringsAsFactors = FALSE,
        Presidente = c("Carlos Menem",
                       "Fernando de la Rúa","Adolfo Rodríguez Saá","Eduardo Duhalde",
                       "Néstor Kirchner"),
           Partido = c("PJ", "UCR", "PJ", "PJ", "PJ"),
              Pais = c("Argentina","Argentina",
                       "Argentina","Argentina","Argentina"),
            Inicio = c("1989-07-08","1999-12-10",
                       "2001-12-23","2002-01-02","2003-05-25"),
               Fim = c("1999-12-10","2001-12-21",
                       "2001-12-30","2003-05-25","2007-12-10")
)
2

I managed to do it by creating a new column and assigning colour codes equivalent to each party.

3

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