Problem when reloading an animated GIF in Chrome

I have an app that reloads an animated gif. It works all the time in Safari and intermittently in Chrome. I believe the problem is similar to one mentioned here.

My knowledge of Javascript is negligible. However, reading this, I came up with this example, which still doesn't work. Using Chrome, if you click again enough times you will see that sometimes the image reload fails.

library(shiny)
library(shinyjs)

jsCode <- '
shinyjs.reset_anim = function() {
  var div_elem = document.getElementById("anim_plot");
  var img_elem = div_elem.getElementsByTagName("img")[0];
  var src_value = img_elem.getAttribute("src");
  img_elem.setAttribute("src", "");
  img_elem.setAttribute("src", src_value);
}
'


# Define UI ----
ui <- fluidPage(useShinyjs(),
                extendShinyjs(text = jsCode),

                plotOutput("anim_plot",
                           width = "900px",
                           height = "200px"),

                fluidRow(
                  column(3,  
                    actionButton("do_again", "Again")
                  )
                )
)

# Define server logic ----
server <- function(input, output) {
  observeEvent(input$do_again, {
    js$reset_anim()
    output$anim_plot <- renderImage({
      list(src = "www/tmp/ani.gif",
           contentType = 'image/gif',
           width = 900,
           alt = "Text"
      )
    }, deleteFile = FALSE)
  })
}

shinyApp(ui = ui, server = server)  

You can find an animated gif here.

from Problem when reloading an animated GIF in Chrome