But even if there is no change in the content, every build has a bit different size of .pak, .utoc and .ucas files. I don’t know why, but it’s observed.
My last statement was before I realized that there could be deterministic cooking issues.
Sometimes they are available in vanilla UE games and sometimes they happen due to the way your game is setup.
Basically the size changes when something is not fixed.
So, something is calculated during your cook time.
For the last couple of months we identified a bunch of deterministic cooking issue using the method detailed by Epic.
Most common issue is use of some Random generator method which doesn’t have a seed in it.
The seed is what gives the deterministic values.
If the seed is not set, the Random functions generate seed based on lets say, time, which is different with each build… hence the cook is different each time, and hence the output .pak/.ucas/.utoc etc.