When installing bzed-dehydrated (1.9) together with stdlib >= 9.0.0 you get the following error
Error: Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Evaluation Error: Unknown function: 'has_key'. (file: /etc/puppetlabs/code/environments/production/modules/dehydrated/manifests/init.pp, line: 238, column: 8) on node <FQDN of Puppetserver>
Since the has_key is deprecated it should be replaced with something modern.
puppetlabs/puppetlabs-stdlib#1319