Looping headers/sections in rmarkdown? - r-markdown

Question

I am trying to generate a loop with sections/headers that are followed by a figure in rmarkdown. I understand that I can use cat("## xyz") to generate a new header in my chunk but I observe some odd behaviour.
---
title: "Untitled"
output: html_document
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = F)
```
Version 1: (does not work)
```{r, results='asis'}
for (i in 1:5) {
cat("\n")
cat("## This is a heading for ", i, "\n")
plot(pressure)
cat("\n")
}
```
Version 2: (does not work)
```{r, results='asis'}
for (i in 1:5) {
cat("\n")
cat("## This is a heading for ", i, "\n")
plot(pressure)
cat("\n")
plot(pressure)
cat("\n")
}
```
Version 3 (works):
```{r, results='asis'}
for (i in 1:5) {
cat("\n")
cat("## This is a heading for ", i, "\n")
plot(cars)
cat("\n")
plot(pressure)
cat("\n")
}
```
I expect the output to be
Header 1
Figure 1
Header 2
Figure 2
Header 3
Figure 3
etc.