Protractor resolves promises with Chrome, but not Phantom - protractor

Question

When running end to end tests with Protractor, I'm seeing promises in my tests being resolved when run with Chrome. But when run with Phantom, the callbacks are never executed, and the test eventually times out with the message Error: Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL.
My protractor.config.js file looks like:
exports.config = {
baseUrl: 'http://localhost:3000/',
suites: {
// ...
},
directConnect: !(process.env.NODE_ENV === 'CI'),
exclude: [],
multiCapabilities: [{
browserName: process.env.NODE_ENV === 'CI' ? 'phantomjs' : 'chrome',
'phantomjs.cli.args': ['--web-security=false',
'--ignore-ssl-errors=true'
]
}],
allScriptsTimeout: 110000,
getPageTimeout: 100000,
framework: 'jasmine2',
jasmineNodeOpts: {
isVerbose: false,
showColors: true,
includeStackTrace: false,
defaultTimeoutInterval: 400000,
print: function() {}
},
}
With this configuration, a test like the following will execute its callback for Chrome, but not for Phantom:
let targetUrl = '/foo';
it ('should resolve the route properly', function (done) {
browser.getCurrentUrl().then(function (url) {
console.log("****"); // This is printed in Chrome, but not Phantom
expect(url).toContain(targetUrl);
done();
})});
Node Modules Versions
Protractor: 5.0.0
Phantom: 4.0.0
PhantomJS 2.1.7
PhantomJS-prebuilt: 2.1.14
Webdriver Manager (inside Protractor): 11.1.1
Any ideas?