Reducing size text does not work when output is docx in Quarto (1.5.9)

[lorenzoFabbri]

I am trying to reduce the size of a long table. Here's a reproducible example:

---
format:
  docx:
    # reference-doc: reference_document.docx
    page-width: 8.3
    citeproc: true

link-citations: true
linkcolor: blue

editor_options: 
  chunk_output_type: console

execute:
  echo: false
  warning: false
  error: false
  message: false
---

::: {#tbl-pop-desc}
```{r pop-desc}
mtcars |>
  gt::gt() |>
  gt::tab_style(
    style = gt::cell_text(size = gt::pct(90)),
    locations = gt::cells_body(
      columns = dplyr::everything()
    )
  )
```
Test.
:::

The resulting table looks massive, whereas the output in RStudio (the preview) looks fine. Am I doing something wrong?

> R.version
               _                           
platform       x86_64-pc-linux-gnu         
arch           x86_64                      
os             linux-gnu                   
system         x86_64, linux-gnu           
status                                     
major          4                           
minor          3.2                         
year           2023                        
month          10                          
day            31                          
svn rev        85441                       
language       R                           
version.string R version 4.3.2 (2023-10-31)
nickname       Eye Holes