I try to document my R package with a vignette and want to print dataframes paged.

It works with

---
title: "Helpfile"
output: 
  rmarkdown::html_document:
    df_print: paged
---

```{r setup}
iris
```

but not with

---
title: "Helpfile"
output: 
  rmarkdown::html_vignette:
    df_print: paged

vignette: >
  %\VignetteIndexEntry{Helpfile}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

```{r setup}
iris
```

The help (.html) says that I can use df_paged the same way as in html_document. What do I get wrong here?