After updating to 1.12 today, I noticed that I cannot give myself more than one unstackable item at any single time, using /give and /replaceitem. No idea why this happens as I could do this perfectly fine before updating to 1.12. The change-log does not mention this either. What's odd is that Mojang purposely made /give bypass the unstackable item restrictions in a previous update, so it would be odd for them to change it back, and restrict it to one item at any single time.
Is this an intended feature, or is it just an annoying glitch?