gtsave with gt_tbl pandoc error

[Meech81]

I've written some code to make a table using tbl_summary. After converting my tbl_summary object to a gt_tbl object I want to use gtsave to export my table to a word document. gt_save is working as expected the first time I run the code but on successive runs I get an error.

Example;

> library(gtsummary)
> 
> tab <- trial |> select(age, grade, response) |> tbl_summary() |> 
> as_gt() 
> 
> gtsave(tab, "tab.docx")

works fine but if I re-run the code;

> tab <- trial |> select(age, grade, response) |> tbl_summary() |> 
> as_gt() 
> 
> gtsave(tab, "tab.docx")

I get this error;

> Unknown output format doc 
> Pandoc can convert to DOCX, but not to DOC.
> Error: pandoc document conversion failed with error 22

If I delete the word document created on the first run, it doesn't error on the second run but I want to produce a large number of tables so that's not a practical solution every time I want to run the code (e.g. after making tweaks).

Any advice would be appreciated @rich-iannone