I have already looked through a few videos to try and find out what is going on here, and can't seem to figure out why I can't progress. I have done what other people have done, with no results. For some reason, I am not getting the Advancement option of "Custom Crafting", even though I'm pretty sure I should have done everything needed to unlock it. Most people seem to get it when they complete cobble cobble cobble. It is not appearing on the Advancements screen where I am seeing it on other people's games. The arrangement of the advancements is also different on my screen than it is for others from what I've seen.

I can put the parts that are necissary to make the custom crafting table together (chisled stone and a drop a crafting table on top), but it doesn't pop together or work at all.  Considering it is completely missing from the Advancements tab, I can only figure this is a bug.