Hi!
This is an incompatibility issue that will occur when loading a save from the previous demo with the new demo! You'll need to start a new save with the new demo to avoid this.
Alternatively, you might be able to load that save by launching the old demo (also available in itchio), loading this save there and doing this alchemy in it, saving and turning it off, then loading that save again in the newer build once you're done. It's not ideal but I believe this should work if you don't want to start from the beginning!