How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix Unity Wave Function Collapse Output With Mismatched Tile Edges

Q: What causes Unity wave function collapse output with mismatched tile edges?

If the compatibility test between tile sockets is wrong, the constraint propagation allows neighbors whose edges do not actually align, so roads and walls break across tile borders.

Quick answer: Define each tile edge's socket, make the compatibility rule symmetric (a left socket matches a neighbor's right socket of the same id), and rotate sockets with rotated tile variants.

Mismatched edges in Unity WFC come from an incorrect socket-matching rule. Making socket compatibility direction-aware and symmetric makes tiles connect.

How to fix it

1. Assign sockets per edge

Give every tile's four edges a socket id describing its border. Store them so you can query a tile's socket on a given side quickly during propagation.

2. Match opposite sides, not same side

Two horizontally adjacent tiles are compatible only if the right socket of the left tile equals the left socket of the right tile. A common bug is comparing the same side of both tiles; compare opposing edges.

3. Rotate sockets with the tile

When you generate rotated tile variants in Unity, rotate the socket array too so a connector that was on the north edge ends up on the correct edge after rotation, or adjacency will silently break for rotated tiles.

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 Unity 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.

The errors you never hear about are the ones quietly costing you players. Visibility turns them into a worklist.