Quick answer: Match recipe ingredients by id and quantity correctly, verify the inventory has enough before consuming, and grant the result and consume inputs atomically.
A crafting recipe that does not work is usually an ingredient-matching or inventory bug. Here is how to fix it.
How to fix it
1. Match ingredients correctly
Compare the recipe's required items and quantities against the inventory precisely. Matching by the wrong key, ignoring quantity, or order-sensitivity makes valid combinations fail to be recognized as a recipe.
2. Check quantities and stacks
Verify the inventory actually holds enough of each ingredient, accounting for stacks split across slots. A check that looks at one slot or ignores counts rejects valid crafts or allows invalid ones.
3. Consume and grant atomically
Remove the ingredients and add the result as one operation, so a failure cannot consume inputs without producing output (or vice versa). Partial crafting is where items get lost or duplicated.
Catching the ones you can't reproduce
The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.
Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.
This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.
Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.