R Shiny in Docker - airDatePicker selecting dates works incorrectly

So, this is a weird issue I noticed. Here is a small example app.R:

library(shiny)
library(shinyWidgets)

print("shinyWidgets version:")
print(packageVersion("shinyWidgets"))

ui <- fluidPage(
  h1("TESTING - airdatepicker"),
  airDatepickerInput("date_menu",
                     label = "Choose date range",
                     value = c(as.Date("2024-06-03"), Sys.Date()),
                     dateFormat = "dd. MM. yyyy.",
                     addon = "none",
                     minDate = "2023-07-08",
                     maxDate = Sys.Date(),
                     range = T,
                     language = "hr"
    ),
  textOutput("results")
  )

server <- function(input, output, session) {
  output$results <- renderText({
    paste0("The range spans from ",
           input$date_menu[1],
           " to ",
           input$date_menu[2])
  })
}

shinyApp(ui, server)

I can run this app on my computer, and I want to change the first day in timespan to be 01.03.2024. instead of 03.06.2024. I just click on 03.06, click left to March and click on the 1st day. It all works as expected.

However, when I run my app in a Docker container, this doesn't work! The selection stays the same, even if I clicked all the way through to March. This is very unintuitive to use, and I can't seem to find what the issue is, any help would be greatly appreciated.

Sample Dockerfile:

FROM rocker/r-ver:4.3.3

RUN apt-get update && apt-get install -y dialog apt-utils
RUN apt-get upgrade -y


RUN R -q -e "install.packages(c('shiny', 'shinyWidgets'))"
COPY app.R app.R

EXPOSE 3838

ENTRYPOINT ["R", "-q", "-e", "shiny::runApp(appDir = './', port = 3838, host = '0.0.0.0')"]

Building the image with docker build -t mkranj/airdatepicker --no-cache ..
Running the container with docker run -p 1234:3838 -it mkranj/airdatepicker:latest and going to http://localhost:1234/ in my browser.

Does anyone have an idea why this happens only when dockerizing the app?

The issue was due to behavior of the specific version of Airdatepicker.
The maintainers have since updated the package with a new version, so this issue shouldn't arise anymore when using shinyWidgets >= v0.8.7 .