How to Fix Inconsistent Chaos or Niagara Simulations in Unreal Engine

I pressed play again. The explosion looked different. The timing in my cinematic broke instantly. This post is part of my daily learning journey in game development. I’m sharing what I learn each day — the basics, the confusion, and the real progress — from the perspective of a beginner. On Day 71 of my game development journey, I learned how simulation caching works for Chaos destruction and Niagara effects in Unreal Engine . What I Tried I created a cinematic shot using Chaos destruction . When I played it in Sequencer , the object shattered nicely. But when I replayed the sequence, the destruction looked slightly different. The same problem happened with Niagara fluid simulations . Each playback produced a slightly different result. This completely broke the timing of the cinematic. What Confused Me Why does the simulation change every time I press play? Why doesn’t Sequencer reproduce the exact same effect? Is Chaos random? Is Niagara simulation unstable? It felt impossible to cont