Is it broken ? I have 7 ingredient on top of the chain link and no key dropped.
Same for me. You are still in the tutorial. Look at the instructions in the background and do what the tutorial wants from you multiple times (one time is not sufficient. See progress bar in the background).
In my opinion this tutorial is worse than having no tutorial. The tutorial explains the more obvious stuff in a cryptic way (symbols ◻, ×, ▶ for keys Z, X, C) but does not explain the less obvious parts, e.g. how things should be combined.