Unclear behavior with symlinked dirs

[aerosol]

Hello, first of all thanks for dirbuf, it's wonderful.
I'm running into a small issue. Steps to reproduce:

$ mkdir -p /tmp/dira/dirb/dirc
$ touch /tmp/dira/dirb/dirc/filea
$ ln -s /tmp/dira/dirb /tmp/linka
$ vim

:e /tmp/linka
<cr>    (enters `dirc`)
<cr>    (opens up `filea`)
-       (expected: open dirbuf in `dirc`, getting: empty buffer)

[robertgzr]

this doesn't reproduce for me 🤔, #53 however (which is quite similar) does