Splom fig not showing any markers

Hello,
The sample code for the splom is not showing the scatter markers for me. I get all the different frames but no markers.

Has this issue been raised by anyone?

library(plotly)
library(dplyr)
df <- read.csv('https://raw.githubusercontent.com/plotly/datasets/master/iris-data.csv')
pl_colorscale=list(c(0.0, '#19d3f3'),
                   c(0.333, '#19d3f3'),
                   c(0.333, '#e763fa'),
                   c(0.666, '#e763fa'),
                   c(0.666, '#636efa'),
                   c(1, '#636efa'))
axis = list(showline=FALSE,
            zeroline=FALSE,
            gridcolor='#ffff',
            ticklen=4)

df %>%
    plot_ly() %>%
    add_trace(
        type = 'splom',
        dimensions = list(
            list(label='sepal length', values=~sepal.length),
            list(label='sepal width', values=~sepal.width),
            list(label='petal length', values=~petal.length),
            list(label='petal width', values=~petal.width)
        ),
        text=~class,
        marker = list(
            color = as.integer(df$class),
            colorscale = pl_colorscale,
            size = 7,
            line = list(
                width = 1,
                color = 'rgb(230,230,230)'
            )
        )
    ) 

Inizia eseguendo l'esempio R fornito per il plotly.R splom trace e verifica come vengono renderizzati i frame e i marcatori di dispersione. L'issue è risolta quando l'esempio visualizza i marcatori attesi nei frame splom.