Huge cell does not split across pages in rmarkdown pdf_document

[CareCT]

Hello,

when I try to render a long flextable with rmarkdown and the "pdf_document" format, the table does not split across multiple pages and the cell content gets truncated.

The rendered pdf document is 4 page long:

• the first page shows the heading ("Test bug") and nothing else;
• the second page is blank;
• the table starts in the third page with two consecutive headers (repeated), and the cell contents get printed up to the bottom border of the page
• the fourth page shows only the table header

This is a minimal reproducible example of the .Rmd document:

---
documentclass: article
geometry: margin=2cm
output: 
  pdf_document: 
    latex_engine: lualatex
    toc: false
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(
  echo = FALSE, 
  message = FALSE, 
  warning = FALSE,
  ft.tabcolsep = 3, 
  ft.latex.float = "none",
  ft.keepnext = FALSE
)
```

```{r}
library(flextable)
library(stringi)

set_flextable_defaults(
  float = "none",
  font.size = 12, 
  border.color = "gray",
  line_spacing = 1,
  padding.bottom = 2,
  na_str = "Not available",
  keep_with_next = FALSE
)
```

## Test bug

```{r}
loremipsum <- stri_c(stri_rand_lipsum(10), collapse = "\n")
d <- data.frame(
  name = "jack",
  value = loremipsum
)

flextable(d) |> 
  width(j = "name", width = 2) |>
  width(j = "value", width = 4) |>
  valign(valign = "top")
```

And this is my sessionInfo():

R version 4.2.3 (2023-03-15 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19045)

Matrix products: default

locale:
[1] LC_COLLATE=Italian_Italy.utf8  LC_CTYPE=Italian_Italy.utf8    LC_MONETARY=Italian_Italy.utf8
[4] LC_NUMERIC=C                   LC_TIME=Italian_Italy.utf8    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] stringi_1.7.12  flextable_0.9.1

loaded via a namespace (and not attached):
 [1] zip_2.3.0               Rcpp_1.0.10             fontBitstreamVera_0.1.1
 [4] compiler_4.2.3          later_1.3.1             gfonts_0.2.0           
 [7] tools_4.2.3             uuid_1.1-0              digest_0.6.31          
[10] evaluate_0.21           jsonlite_1.8.5          lifecycle_1.0.3        
[13] rlang_1.1.1             shiny_1.7.4             cli_3.6.1              
[16] rstudioapi_0.14         crul_1.4.0              curl_5.0.0             
[19] fontLiberation_0.1.0    xfun_0.39               fastmap_1.1.1          
[22] xml2_1.3.4              officer_0.6.2           knitr_1.43             
[25] gdtools_0.3.3           systemfonts_1.0.4       askpass_1.1            
[28] grid_4.2.3              glue_1.6.2              httpcode_0.3.0         
[31] data.table_1.14.8       R6_2.5.1                textshaping_0.3.6      
[34] rmarkdown_2.22          magrittr_2.0.3          fontquiver_0.2.1       
[37] promises_1.2.0.1        htmltools_0.5.5         ellipsis_0.3.2         
[40] mime_0.12               xtable_1.8-4            httpuv_1.6.11          
[43] ragg_1.2.5              openssl_2.0.6           crayon_1.5.2 

Finally, thanks for you great work, this package is awesome!