Why cook result is different without changing source uasset

We want to use the patch system.First I create releaseversion 1.0,then immediately create patch base version 1.0,I didn’t change any thing,But the patch is big,I found some unchange content is included in the patch pak.The uasseet are the same, but the correspond uexp are different.Why?Please help ,thank you

I guess this have something to do with UMovieSceneSequence class.UMG which contain animation all cause this result.

UMovieSceneSignedObject has a member named Signature,It changes everytime i cook,So serialize result is different,Is it a bug?

I found the same problem when I wrote some logic in a blueprint, but I don’t know why the logic affected Cook’s results.Is there any solution?

Have you solved this problem? I had the same problem in my project