Quick answer: Fix up redirectors after moves, audit soft object paths against what actually packages, and include referenced content in the build (or gate the code paths that request it).
In-editor this is an annoyance; in a packaged game it means content the build genuinely lacks. The reference and the packaging must be reconciled. Here is the audit.
How to fix it
1. Fix up redirectors routinely
After moving/renaming content, right-click the folder > Fix Up Redirectors; stale redirectors deleted later leave exactly these dangling paths.
2. Audit soft references
Soft object paths in data tables, config, and code do not force content into the build the way hard references do — verify every soft path's target is reachable from a packaged root or explicitly added to the cook list.
3. Check chunk and plugin boundaries
Content assigned to a chunk or plugin that is not shipped/mounted yet fails at request time — align your chunk mounting order with what early code requests.
4. Log and capture in shipped builds
Wrap dynamic loads with error capture including the requested path — player reports of this pinpoint the missing asset without a repro.
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.
Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.