backgroundColor for datatable (DT) not working for grid_page

[schwa021]

I have a shiny app built with a grid_page.
There is a datatable (DT) output
I do some formatting on the datatable. Most of the formatting works (hover, stripes, fontsize, etc....)

However, background color does not work.

Reproducible example follows:

library(shiny)
library(plotly)
library(gridlayout)
library(bslib)
library(DT)
library(tidyverse)

df <- tibble(
  x = c(-.5, -.1, 0, .1, .5),
  y = c("Dark Red", "Light Red", "White", "Light Green", "Dark Green")
)

formatdetails <- function(x){
  x <- 
    x %>% 
    datatable(
      rownames = FALSE,
      class = list(stripe = FALSE),
      options = list(
        pageLength = 5,
        lengthMenu = c(5, 10, 15, 20, 25),
        order = list(1, 'asc')
      )
    ) %>% 
    formatStyle(
      columns = "x",
      target = "row",
      backgroundColor = styleInterval(
        cuts = c(-.2, -.05, .05, .2),
        values = rev(c("#005600", "#42A644", "#F1F1F1", "#DD6BA6", "#841859"))
      ),
      color = styleInterval(
        cuts = c(-.2, -.05, .05, .2),
        values = c("#e6e6e6", "#e6e6e6", "#0d0d0d", "#e6e6e6", "#e6e6e6")
      )
    )  %>% 
    formatStyle(columns = c(1:4), fontSize = '80%')
} 

ui <- grid_page(
  layout = c(
    "header header",
    "area2  .     "
  ),
  row_sizes = c(
    "100px",
    "1fr"
  ),
  col_sizes = c(
    "590px",
    "1fr"
  ),
  gap_size = "1rem",
  grid_card_text(
    area = "header",
    content = "Test",
    alignment = "start",
    is_title = FALSE
  ),
  grid_card(
    area = "area2",
    card_body(DTOutput(outputId = "tblcard", width = "100%"))
  )
)

server <- function(input, output) {
   
output$tblcard <- renderDT(df %>% formatdetails())

}

shinyApp(ui, server)

The resulting table is all white:

### Tasks