Reproduction steps:
1. Open attached project "crcCheck"
2. Open scene "demo"
3. Using the editor enter play mode
4. Press the UI button
5. Check the console
--- The Asset bundle will not download because the CRC is incorrect
6. Build for iOS
7. Press the UI button on the device
8. Check Xcode console
--- You will see no error about the incorrect CRC
--- Also you should see that the asset was successfully spawned

Note:
--- Repro project downloads a bundle from a http address, this will not work on iOS 9