What's making print_md() work outside a loop and then not work in a loop?

If I use print_md() in an Rmd document to be knitted to PDF, it works just fine (the rendered table looks like beautiful latex output), until I use it in a loop. Then unpredictable things can happen, but it's usually just the un-pretty console output. Below is a reprex:

library(tidyverse)
library(parameters)

lm(
cty ~ manufacturer,
data = mpg
) %>%
model_parameters() %>%
print_md(caption = "City miles")

mpg %>% select(cty,hwy) %>% names() %>%
map(.f = function(response){
lm(
formula(str_c(response," ~ manufacturer")),
data = mpg
) %>%
model_parameters() %>%
print_md(caption = response)
})

Using print_md() inside purrr::map() prints out un-pretty console-esque tables in PDF.

Is there a fix for this or something I'm not doing right?

Start with the reprex in the issue and compare print_md() called directly with the same call inside purrr::map() while knitting to PDF. Trace why the loop produces console-style tables; done when mapped results render as formatted LaTeX tables like the direct call.