JENKINS_HOME ignored in JENKINS 1.544

JENKINS 1.544 ignores env var JENKINS_HOME for the WAR extraction.

D:\temp>set JENKINS_HOME=D:\temp\jserver

D:\temp>java -jar jenkins-1.531.war
Running from: D:\temp\jenkins-1.531.war
webroot: EnvVars.masterEnvVars.get("JENKINS_HOME")
18.12.2013 10:13:21 winstone.Logger logInternal
INFO: Beginning extraction from war file

=> extracts to D:\temp\jserver\war

D:\temp>set JENKINS_HOME=D:\temp\jserver

D:\temp>java -jar jenkins-1.544.war
Running from: D:\temp\jenkins-1.544.war
webroot: EnvVars.masterEnvVars.get("JENKINS_HOME")
18.12.2013 10:15:15 org.eclipse.jetty.util.log.JavaUtilLog info
INFO: jetty-8.y.z-SNAPSHOT
18.12.2013 10:15:17 org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Extract jar:file:/D:/temp/jenkins-1.544.war!/ to C:\Documents and Settings\...\Local Settings\Temp\jetty-0.0.0.0-8080-jenkins-1.544.war-any\webapp

=> extracts to C:\Documents and Settings\...\Local Settings\Temp\jetty-0.0.0.0-8080-jenkins-1.544.war-any\webapp, why?