Firebase Storage/Bucket public upload with node.js

Code:

var storage = require('@google-cloud/storage');
var gcs = storage({
    projectId: config.google.projectId,
    keyFilename: config.google.keyFilenameFirebase
});

var bucket = gcs.bucket('project-id.appspot.com');
var destination = 'uploads/12345/full.jpg';

bucket.upload(myFile, { public: true, destination: destination }, function(err, file) {
    if (err) {
        console.log(err);
    }
});

My file is successfully uploaded to my firebase storage, but:

1. The file is now publicly accessible through the url: https://storage.googleapis.com/project-id.appspot.com/uploads/12345/full.jpg. Can I use this fixed URL in my App or is it likely, that it will change or expire?
2. public: true seems to break the Firebase Storage UI:

The preview of the image on the right side is not showing and I'm unable to download the image via the download button. Also, there is no download url (which I don't mind, cause I can access it via the link above) and when clicking "Create new download URL" Firebase yields

Error generating download URL

When removing public: true the preview is shown correctly and I can also generate a download URL. But the public url https://storage.googleapis.com/project-id.appspot.com/uploads/12345/full.jpg won't work anymore, which is necessary for me.

So my plan is to stick to public: true, but it still bugs me, that the preview/download button is not working and it looks like a bug in Firebase to me. Can anyone confirm that?