Steps to reproduce:
1. Open users attached project "Demo.zip"
2. Open Addressables window (Window > Asset Management > Addressable Assets) then clear the cache (Build > Clean > All)
3. Rebuild the Addressables cache (in addressable window, Build > Build Player Content - Make sure you've built the Player along with the Editor or the assetbundle build will fail with compilation errors)
4. Enter play mode
5. Wait for a few seconds for a GameObject to spawn

-- Observe the head of the blue model

Expected results: 3D models from Assetbundles are loaded without any deformations
Actual results: 3D models from Assetbundles are loaded with deformations

After step 2, performing this extra step fixed the issue: Open Player Settings (Editor > Project Settings) and change Optimize Mesh Data to false

Reproducible with: 2019.1.8f1(preview - 1.1.3), 2019.2.0b7(preview - 1.1.3), 2019.3.0a7(preview - 1.1.3)

Note: Version 2018.4.2f1 and lower throw bunch of package errors, fixing them would ruin the project