Happens a lot with UE4. They frequently deprecate code without warning and it isn't in their update notes.
I ran into issues like they are back when I tried to make a game in UE4. I was trying to follow a tutorial for the UE4 v0.7 and I was on v0.9, and most of the tutorial code would not work at all as a result, of several key bits of blueprint scripts no longer existing.
Now, if you were doing things purely with C++, you wouldn't have this issue as you wouldn't be relying on Epic's code directly, and thus their implementation even if it changed, would not affect your code that much. But if you do it via Blueprint Scripting, you are going to be in a world of hurt.
Hence why I stopped developing in UE4... maybe some day I will return to UE4...
Edit: Although... what the hell were they thinking doing an engine update so close to an actual release. Even if the code doesn't change, it still takes a while to get used to the new features and possibly game development flow, so it would be pretty stupid to try to learn all that right before a release. It might take them over a week to fix whatever issue they have.