Problem using plotOutput click options with par() plot() plots

... I am having problems getting the plotOutput click option to work correctly when creating a multiple plot output using par(). Clicking on the left third of the first column plots and the last quarter of the forth column plots does not activate the plot_click event.

A simple example

ui <- basicPage(
  plotOutput("plot1", click = "plot_click"),

server <- function(input, output) {
  output$plot1 <- renderPlot({
    nrow = 2
    ncol = 4
    par(mfrow = c(nrow, ncol), mar = c(1, 3, 2, 1), oma = c(2,0,2,0), cex.main = 2)
    for (i in 1:8)
      plot(mtcars$wt, mtcars$mpg)

  output$info <- renderText({
    paste0("x=", input$plot_click$x, "\ny=", input$plot_click$y)

shinyApp(ui, server)

Any help would be appreciated.

The domain$right and domain$left are incorrect. The click event is not firing outside of the domain (as it should), but the domain boundaries are do not encompass the entire plot.