Highchart map in flexdashboard disappears after refreshing

I am trying to make a shiny-based data dashboard with some geo-referenced data so I am trying to work with highchart and flexdashboard. I find that the map rendered using renderHighchart only appears right after running the document but disappears after refreshing the page (seems the map only shows up when there is "please wait..."). Any idea why this happens or how to get around it?

A reprex on my Ubuntu 20.04 with R4.1.3, here

title: "No refresh"
    orientation: columns
    vertical_layout: fill
    runtime: shiny

```{r setup, include=FALSE}

Column {data-width=650}

Chart A

  hcmap("countries/us/us-ca-all") %>%
  hc_title(text = "California") %>% 
  hc_subtitle(text = "You can use the same functions to modify your map!")

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