plotly problem of specifying point symbol within the boxplot

Hi I am trying to specify the point symbol (shape) based on a factor, so that the point shape within the boxplot can be different (which can be very useful for highlighting a group of points). However, it looks like instead of showing different shapes, the third boxplot got split into two boxes.

Can you please advise how to achieve that?

Brief description of the problem

library(dplyr)
data(iris)
iris=mutate(iris, Petal.Width_high=ifelse(Petal.Width>2,"High","Low"))

iris %>% plot_ly(x = ~ Species, y = ~ Petal.Width, color= ~ Species,
                 symbol = ~ Petal.Width_high,
                 type = "box", mode="markers",boxpoints="all",
                 jitter = 0.4, marker = list(size = 10),
                 pointpos = 0,hoverinfo='text',
                 text= ~paste('</br>Species: ', Species,
                              '</br>Petal.Width: ', Petal.Width))

Inizia riproducendo l'esempio R fornito con iris, plot_ly, boxpoints="all" e symbol associato a Petal.Width_high. Indaga sul motivo per cui l'associazione di symbol divide il terzo boxplot e considera conclusa l'issue quando all'interno di ogni box vengono visualizzati simboli di punto diversi senza modificare il raggruppamento dei box.