Opening a new issue in an attempt to shine some light on my last comment in #1158 and the behaviour observed rendering the `README.pod` [here](https://github.com/jhthorsen/applify). I have a mixture of private repositories using the same technique that have a mix of success and failure in displaying the expected result and a minimal example of success [here](https://github.com/kiwiroy/markup-1158-plus)

The symlinks are detected as POD as reported [here](https://github.com/jhthorsen/applify/search?l=Pod).

Running locally `github-markup`, `pod2html` converts as expected:

```console
$ git rev-parse --short HEAD
8f436ff
$ bundle show | grep linguist
* github-linguist (7.1.3)
$ bundle exec bin/github-markup ../applify/README.pod | head

NAME

Applify - Write object oriented scripts with ease

VERSION

0.15

DESCRIPTION

$ perl -v | head -n2 | tail -n1
This is perl 5, version 26, subversion 2 (v5.26.2) built for darwin-thread-multi-2level
```

I did some sanity checking in [linguist](https://github.com/github/linguist/compare/master...kiwiroy:markup-1158) with additional tests, they all passed.