Alpha 19 Building a staircase up to a mountain bug

Hey there everyone, so I started a new series a while ago on Youtube on alpha 19, and playing Rayas Children in the desert. And I decided to make a funny looking stairway going up into the large mountains that you see in the desert map. Unfortunately the hearthlings were not able to figure out a way on how to build this staircase. Here is the link to the video. I recommend you skip until 4:50 minutes into the video to see the staircase building part.

Let me know what you guys think!

In cases like that, if you want to avoid the cheat, try adding ladders to the blocks that they refuse to build. Sometimes they are just trying from an impossible angle.