Cross-referenced longtable caption repeated on page break

Quarto injects the \caption and \label into the longtable, but places them before \endhead without adding a separate \endfirsthead block. This causes the caption to repeat on every page.

Discussed in https://github.com/orgs/quarto-dev/discussions/14145

^{Originally posted by jtatria March 3, 2026}

Description

I'm trying t format a very long table with repeated headers in each page using gt with latex options longtable and header_repeat, but I'm getting repeated table captions on each page, and multiple entries in the list of tables.

How can I accomplish a long table with repeated headers but a single caption?

I already tried using gt's own gt:tab_caption, but the caption wouldn't show in quarto.

MRE:

---
title: "gt demo"
format:
  pdf:
    documentclass: report
    lot: true
---

## Demo

```{r}
#| label: tbl-demo
#| tbl-cap: "Caption repeats"
	gt::gt( iris ) |> gt::tab_options(
		latex.use_longtable=TRUE,
		latex.header_repeat=TRUE
	)
```
```

Any help would be greatly appreciated. Thanks!

Reproduce the supplied Quarto/gt MRE with PDF output, longtable, and repeated headers, then trace the longtable caption and label generation in Quarto CLI. Verify the result by confirming one caption and one list-of-tables entry while headers still repeat on page breaks.