opt_interactive() doesn't respect cols_merge()

[olivroy]

Description

Merging doesn't happen with interactive html tables.

gt_tbl <- sp500 |>
    dplyr::slice(50:55) |>
    dplyr::select(-volume, -adj_close) |>
    gt::gt() |>
    cols_merge(
        columns = c(open, close),
        pattern = "{1}&mdash;{2}"
    ) |>
    cols_merge(
        columns = c(low, high),
        pattern = "{1}&mdash;{2}"
    ) |>
    cols_label(
        open = "open/close",
        low = "low/high"
    ) 
gt_tbl

gt_tbl |> opt_interactive()

The colums are properly hidden however.

Expected result

The merged cells to show.

Session info

Latest gt version (0.11.0)