Custom facts in hiera hierachy not working in CentOS 7

edit

I'm trying to debug a problem where the custom facts from a node are not being used correctly when looking for hiera data. This is my hiera.yaml file:

---
:backends:
  - eyaml
  - yaml
:hierarchy:
  - "nodes/%{::trusted.certname}"
  - "role/%{::instance_role}"
  - "environments/%{::environment}"
  - certs
  - common

:yaml:
# datadir is empty here, so hiera uses its defaults:
# - /etc/puppetlabs/code/environments/%{environment}/hieradata on *nix
# - %CommonAppData%\PuppetLabs\code\environments\%{environment}\hieradata on Windows
# When specifying a datadir, make sure the directory exists.
  :datadir:

When I use this with a CentOS 6 node (vagrant box) and /opt/puppetlabs/facter/facts.d/instance_role.txt is set to:

instance_role=web

This works fine. However with the same setup on CentOS 7 (vagrant box) it gives:

Error: Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Evaluation Error: Error while evaluating a Function Call, Could not find data item haproxy::listen in any Hiera data file and no default supplied at /etc/puppetlabs/code/environments/dev/site/profile/manifests/haproxy.pp:41:40 on node vagrant.example.com

If I change "role/%{::instance_role}" to "role/web" in hiera.yaml, then that works fine, but it doesn't look like puppet is passing on the custom fact on CentOS 7.

Using puppet 4.7.0, hiera 3.2.1, facter 3.4.1