Can't share in Google Keep via the app, only via the webpage

As you know , since late 2014 Google Keep allows sharing notes with others. But I've noticed I can't share in Android (tried in Samsung Galaxy S4 mini GT-i9195i) with another Gmail account. There's a save confirmation with a "viewing shared note" message, but it doesn't actually share. As if I never shared in the first place. It also doesn't auto-fill when I start typing the other Gmail account. As soon as I try it via Google Keep's webpage, it works flawlessly. It auto-fills the other other Gmail account and actually shares with it. Any idea why?