IDE launch configuration not starting ESB in debug mode

Setting the KARAF_DEBUG environment variable does not open the default debug port (5005) . To reproduce:
*Register a FuseESBEnterprise-7.0.0 as a server in IDE 2.1.
*Double click to get the server Overview
*Open launch configuration
*Click on the Environment tab
*Add variable KARAF_DEBUG value true
*Append environment to native environment
*Click OK
*Right click on the server and Start

I would expect to see the following as per setting "export KARAF_DEBUG=true" on the command line:
karaf: Enabling Java debug options: -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005
Listening for transport dt_socket at address: 5005
Please wait while Fuse ESB is loading...

Port 5005 is closed to telnet