Quick answer: Unreal PCG graph using cached output despite inputs changing? Cache hash misses some input - explicitly mark cache-bust on critical inputs.
Changed a Spline input; PCG produces same output; cache hit.
Mark input as cache-bust
PCG input node > Invalidate Cache. Changes force regen.
Or version inputs
Each input has a version field; bump on change.
Audit cache hit rate
PCG debugger shows per-graph cache hits. False hits = the bug.
“PCG cache is heuristic. Critical inputs need explicit bust.”
If your PCG output is stale, the cache-bust setup is mandatory per critical input.