state-machine rules and oldValue() and becomes() functions

Hi everyone!

I will try to get the old value of the issue field State when State changes from one to other:

transitions: {
    'testEnvInstall': {
         targetState: 'testEnvInstall',
         action: function(ctx){
               console.log(ctx.issue.fields.State.oldValue());
         }
    },
 // TODO: define other transitions from the initial values
 }

but I got exception:

org.mozilla.javascript.JavaScriptException: Invalid argument: undefined

but why? Perhaps because the state marked as:

initial: true

and the whole history of the State become empty?