cells_stubhead() doesn't style the full stubhead when more than 1 spanner level

[olivroy]

Works as expected

library(gt)

exibble |>
  gt::gt(rowname_col = "row") |>
  tab_spanner("spanners", c(char, num)) |>
  # tab_spanner("spanne2rs", c(char, num)) |>
  
  tab_stubhead("Stub row") |>
  tab_style(
    style = cell_fill("#f0f0f0"),
    cells_stubhead()
  ) 

The top left cell isn't styled when there are 2 spanner levels

two_levels <- exibble |>
  gt::gt(rowname_col = "row") |>
  tab_spanner("spanners", c(char, num)) |>
  tab_spanner("spanne2rs", c(char, num)) |>
  
  tab_stubhead("Stub row") |>
  tab_style(
    style = cell_fill("#f0f0f0"),
    cells_stubhead()
  )
two_levels

Surprisingly, this works as expected in grid!

plot(two_levels)

I would expect the html (and LaTeX) output to look like the grid output

I am using the latest gt version with 0.11.0.9000. Verified that this was an issue in 0.10.1 as well