How to Fix Auto-Battler Units Snapping to the Wrong Slot in Unreal

Drag a unit to the board and it lands two slots over or on an occupied tile. Snapping to the nearest valid free slot fixes placement. Here is how.

How to fix it

1. Find the nearest slot

On release, compute the closest slot center to the cursor's world position rather than using the drag start or raw hit point.

2. Validate the slot

Confirm the nearest slot is on a legal surface (board vs bench, within unit-count limits) and unoccupied. If occupied, support a swap or pick the next-nearest free slot.

3. Snap or revert

If a valid slot is found, lerp the unit's transform to that slot center; otherwise snap it back to its original slot so a bad drop never leaves a unit floating.

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 Unreal Engine 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.