[SOLVED]Dlc Assetbundle exception

I encountered a headache problem：I use assetbundle for my game by DLC; I found question:
1. first version: build all and install and run; It's OK
2. then, I change some asset path: such as fbx / texture(png) (sprite repacker) file; move to another dir path and build all
It's exception:
if reinstall and run, It's OK
if use DLC, It's error: some prefab not render and some ui show white panel

MD5 algorithm is used to compare differences.The resources that are downloaded are complete!

3. then, I recover fbx path, only change prefab path. It's OK........ WTF....
Who can tell me what's wrong?
It's only appear on ios platform! Android is OK.
Unity3d version is:2017.4.1f1 64bit

 

I removed BuildAssetBundleOptions.DeterministicAssetBundle when BuildPipeline.BuildAssetBundles, It's OK. Why?