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))

Start by reproducing the supplied R example with iris, plot_ly, boxpoints="all", and symbol mapped to Petal.Width_high. Investigate why the symbol mapping splits the third boxplot, and consider the issue done when different point symbols render within each box without changing the box grouping.