DT package extension "Buttons" partially not working with Electron UI

In the minimal example below, using the new Electron UI the button `copy` works, however, the buttons `print`, `csv`, `excel`, `pdf `do not, compared to full functionality in IE, Firefox, and Chrome.
Admittedly, the buttons `csv`, `excel`, and `pdf `do not work in RStudio browser as well, so it is better to start the app in chrome or firefox to test their functionality.
```
library(shiny)
library(DT)
shinyApp(
ui = fluidPage(DTOutput('tbl')),
server = function(input, output) {
output$tbl = renderDT(
datatable(
iris, extensions = 'Buttons', options = list(
dom = 'Bfrtip',
buttons = c('copy', 'csv', 'excel', 'pdf', 'print')
)
)
)
}
)
```