Xcode lldb not storing properties

I am currently using Xcode 6.3.1. In the debug area, I pause the app and store a property like p NSString * $test = @"word" in the debug window. If I type po $test the output would be word, this is perfect but as soon as I let the app run. When I pause it again out of scope of the class/method it seems that they property is nil. When I type p $test my output would be (NSString *) $test =.

Is this a bug with this version of Xcode or can it be fixed?

Thanks