Unable to stop Logstash with a unix input

With the following minimal configuration:

I'm unable to stop Logstash, I just get the familiar:

This is similar to LOGSTASH-1290. See for why the TCP input is there. Given the configuration with only the TCP input defined stops as expected, I can only assume that it's the unix input at fault as to why I can't stop Logstash yet I can't create a configuration that only has a unix input defined .