puppetserver injects its

Puppet::Util::Execution.execute

implementation which ultimately calls into clojure. I would expect the stderr output to be logged to puppetserver's log based on https://github.com/puppetlabs/clj-shell-utils/blob/bf95a25bcd8865c7770f26188b0f25ba9aee0b76/src/java/com/puppetlabs/puppetserver/ShellUtils.java#L100-L102