RShiny- DT::renderDataTable works on server environment console (No Error Logs) but disconnect when someone using link

shiny shinyapps.io
,
1

I am facing issues with DT::renderDataTable with reactive function (which I am using to select Drag and Drop columns to filter selected columns to show on UI). It works on server environment console console but disconnect when I am running on RServer using link. It breaks when it was trying to populate dataframe on UI. All package versions are same and I am using R 3.6.1. There are no Error logs in console while running on locally.

This was working fine few days back, but not working now.

Below is the snippet of code.

library(dplyr)
library(shiny)
library(shinyBS)
library(sortable)
library(shinyWidgets)
library(tidyr)
library(tidyverse)
library(tidyselect)

rv <- reactiveValues(data = NULL)

  bsModal(id = "modalExample",title =  'Select Features and Re-Arrange ', 
  trigger =  "tabBut", size = "large",

  radioButtons('radio', 'Select Action', choices = 
                  list('Default' = 'Default', 'Custom' = 'Custom'),
                  selected = 'Default', inline = T),
  bucket_list(
    header = "Select Features and Re-Arrange", group_name = "bucket_list_group",
        add_rank_list(
          text = "Drag from here",
          labels =
            c("Code","To", "Name", "From","Desc","Distance"),input_id = "rank_list_1"
        ),
        add_rank_list(
          text = "To here", labels = NULL,
          input_id = "rank_list_2"),orientation = 'horizontal')
    )

main_df <- reactive({
selected_action = input$radio

if(selected_action == 'Custom' ){
result <- rv$df %>%
select(all_of(input$rank_list_2))
}
else{result <- rv$df}
return(as.data.frame(result))
})

output$content <- DT::renderDataTable({
if(is.null(main_df())) return()
DT::datatable(main_df(),
selection = 'none', filter = 'top', editable = FALSE, options = list(autoWidth = TRUE))
})