Looks like we can't reproduce the issue or there's a problem in the test case provided.
Sencha SDK Tool 126.96.36.199-Beta
I just installed sencha sdk tools 2.0.0-Beta and when I type the command "sencha package packager.json", it hangs after adding the file '.....build\native\proguard-project.txt'. There is a big blank space and then the command finishes. I don't know if the build is successful or not. I don't think it is. I'm trying to natively deploy my android app but I haven't had any luck. Any help would be appreciated. thanks.
Do you see a JSB3 file?
Are you using Beta3?
Also... have you tried the new Sencha Cmd?
I got it working with the new Sencha Cmd V3!