Reading this thread made me realize it too.
Thanks to the crafting bug, it seems you can generate Mystic Syrup using Fiber, Catalogue, and Deconstructor.
Here are the steps:
First, gather the following materials:
- Fiber (25)
- Furniture obtained from the Catalogue (11)
Next, carefully craft a Blue Grass Starter and place it in the Deconstructor.
This will allow you to easily obtain Mystic Syrup.
However, since this exploits the crafting bug, even a minor mistake risks losing valuable items.
Please proceed at your own risk.