Quick answer: Always commit .meta files alongside their assets, remove any .meta ignore rules, and enable visible meta files so missing ones are obvious before they cause silent breakage.
If references break only for some teammates, a .meta file is missing from version control. Here is how to keep GUIDs stable for everyone.
How to fix it
1. Use the Unity .gitignore
Start from Unity's official .gitignore and confirm it never excludes *.meta — the meta file carries the GUID that every reference depends on.
2. Set visible meta files
Switch Version Control mode to Visible Meta Files so each asset's .meta sits next to it and is easy to stage.
3. Verify pairs in CI
Add a check that fails the build if any asset lacks a committed .meta or any .meta lacks its asset, catching the mismatch before it spreads.
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.
The errors you never hear about are the ones quietly costing you players. Visibility turns them into a worklist.