Aspect ratio of geom_map is distorted after conversion to plotly

Disclaimer: This is a x-post from stackoverflow, but the longer I ponder around this issue, the more I think, this might be a bug.

I am trying to create an interactive map of Germany with plotly and ggplot. At last, I'd like to overlay geom_points with tooltips, but so far I am struggeling with the aspect ratio.

I create the plot like this:

library(tidyverse)
library(ggplot2)
library(plotly)

p <- map_data("world") %>%
  filter(region=="Germany") %>%
  ggplot(aes(x=long, y = lat, group = group)) +
  geom_polygon(fill="grey") +
  coord_map()

When simply plotting it with ggplot, the aspect ratio of Germany is how I know it from school.

p

When converting it to a plotly plot with ggplotly the plot is distorted.

ggplotly(p)

Any ideas how to fix it? I don't know whether this is relevant, but I used to run this code in an R Markdown document.

Thanks a lot.

Start with the R example using map_data("world"), geom_polygon(), coord_map(), and ggplotly() to reproduce the distorted Germany map. Compare the static ggplot output with the converted interactive plot and investigate how the coordinate settings are transferred. Done means the interactive result preserves the original aspect ratio while still supporting the intended overlay and tooltips.