Filtering not working with `renderDT` in `flexdashboard`

[nikitautiu]

🐛 Bug

Description

Even when using client-side processing by passing server = FALSE to renderDT, filtering does not work properly in flexdashboard. Filtering does work properly when not using reactive rendering or when using reactive rendering with renderDT in a script-based shiny app.

How to reproduce

---
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
    theme: 
      version: 5
  
runtime: shiny
---

```{r setup, include=FALSE, echo = FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

# CAR VIEW 


## Sidebar {.sidebar}
### 

```{r, echo = FALSE}
shared_car_data <- crosstalk::SharedData$new(mtcars)
crosstalk::filter_checkbox("car_carb", "carb", shared_car_data, ~ carb)
```

##
###
```{r, echo =FALSE}
# DOESN'T WORK!

DT::renderDT(
  DT::datatable(shared_car_data), server = FALSE
)
```

##
###
```{r, echo = FALSE}
# WORKS

DT::datatable(shared_car_data)
```

The second block yields correct results when filtering, whereas the renderDT one does not.

A minimal shiny app using renderDT which yields the proper results:

shared_car_data <- crosstalk::SharedData$new(mtcars)

ui <- shiny::fluidPage(
  shiny::titlePanel("CAR VIEW"),
  shiny::sidebarLayout(
    shiny::sidebarPanel(
      crosstalk::filter_checkbox("car_carb", "carb", shared_car_data, ~carb)
    ),
    shiny::mainPanel(
      DT::dataTableOutput("car_table")
    )
  )
)

server <- function(input, output, session) {
  output$car_table <- DT::renderDT({
    DT::datatable(shared_car_data)
  }, server = FALSE)
}

# Run the app
shinyApp(ui = ui, server = server)

Filtering for carb == 8 yields the same results as the second cell in the flexdashbaord:

Intended behaviour

I assume all 3 examples should yield the same results post filtering.

sessionInfo()

R version 4.3.2 (2023-10-31)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 22.04.3 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3 
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.20.so;  LAPACK version 3.10.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

time zone: Etc/UTC
tzcode source: system (glibc)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] crosstalk_1.2.1     DT_0.33             flexdashboard_0.6.2
[4] shiny_1.8.1.1      

loaded via a namespace (and not attached):
 [1] jsonlite_1.8.8    compiler_4.3.2    promises_1.2.1    Rcpp_1.0.12      
 [5] stringr_1.5.1     later_1.3.2       jquerylib_0.1.4   yaml_2.3.8       
 [9] fastmap_1.1.1     mime_0.12         R6_2.5.1          knitr_1.45       
[13] htmlwidgets_1.6.4 tibble_3.2.1      bslib_0.6.1       pillar_1.9.0     
[17] rlang_1.1.3       utf8_1.2.4        cachem_1.0.8      stringi_1.8.3    
[21] httpuv_1.6.14     xfun_0.41         fs_1.6.3          sass_0.4.8       
[25] lazyeval_0.2.2    memoise_2.0.1     cli_3.6.2         magrittr_2.0.3   
[29] digest_0.6.34     rstudioapi_0.15.0 xtable_1.8-4      lifecycle_1.0.4  
[33] vctrs_0.6.5       evaluate_0.23     glue_1.7.0        fansi_1.0.6      
[37] rmarkdown_2.25    tools_4.3.2       pkgconfig_2.0.3   ellipsis_0.3.2   
[41] htmltools_0.5.7