I am not sure how to “report this through the official channels”, but the deploy documentation for IonicPro is broken.
According to the documentation, the extract call should return a true callback when the extraction is done.
But as I found out by adding logs, it actually return done instead.
[Log] extract progress = 91 (cordova.js, line 1731, x141)
[Log] extract progress = 92 (cordova.js, line 1731, x158)
[Log] extract progress = 93 (cordova.js, line 1731, x151)
[Log] extract progress = 94 (cordova.js, line 1731, x121)
[Log] extract progress = 95 (cordova.js, line 1731, x77)
[Log] extract progress = 100 (cordova.js, line 1731)
[Log] extract progress = done (cordova.js, line 1731)