Rendering a parametrised Quarto report for multiple input parameters overwrites output figures

Taking the following example Quarto file:

# life_expectancy_report.qmd
---
title: "Life Expectancy Report for `r params$country`"
format: html
params:
  country: "Afghanistan"
---

```{r}
library(tidyverse)
library(gapminder)
```

```{r}
#| label: life-expectancy-data
life_expectancy <-
  gapminder |>
  filter(country == params$country)
```

## Life Expectancy in `r params$country`

```{r}
#| label: life-expectancy-plot
ggplot(life_expectancy, aes(year, lifeExp)) +
  geom_line() +
  theme_minimal()
```

When we generate this report for different countries with the following script:

library(quarto)
countries <- c("Afghanistan", "Belgium", "India", "United Kingdom")

for (country in countries) {
  quarto_render(
    input = "life_expectancy_report.qmd",
    output_file = paste0("life_expectancy_", country, ".html"),
    execute_params = list(country = country)
  )
}

We get a different report for each country, but they will all show the exact same plot (namely the one for the last country).

I suspect this is because Quarto will overwrite life_expectancy_report_files/figure-html/life-expectancy-plot-1.png for each input parameter and thus the final HTML files will all show the same plot.

This behaviour is different from rmarkdown::render(), which would correctly show the specific plot in each report.

Reproduce the issue with life_expectancy_report.qmd and the loop calling quarto_render() for the four countries. Start by inspecting how output_file and the generated life_expectancy_report_files/figure-html assets are handled across renders. Done means each generated HTML report displays the plot for its own country, as rmarkdown::render() does.