How to reproduce:
1. Open the attached project ("case_1211014-ContentUpdateTests.zip")
2. Open the repro scene ("SampleScene")
3. Build Player Content (Be sure Addressables is in Packed Play Mode)
4. Navigate to Library/com.unity.addressables/StreamingAssetsCopy/aa/[your platform name]/[your build target]
5. Note the hash of the "defaultlocalgroup" bundle in the directory listed above
6. Modify any of the three object prefabs (Cube, Sphere, Cylinder)
7. Prepare For Content Update
8. Build For Content Update - use the same ".bin" file from step 7
9. In Library/com.unity.addressables/StreamingAssetsCopy/aa/[your platform name]/[your build target], be sure only 1 "defaultlocalgroup" bundle exists and its hash matches the one you noted in step 6
10. Play the scene and make sure all 3 objects still load

Expected results: All 3 objects are loaded
Actual results: None of the objects are loaded, " Unknown error in AsyncOperation" errors are thrown

Reproducible with:2018.4.16f1, 2019.2.19f1, 2019.3.0f5, 2020.1.0a20
Reproducible with package versions: 1.2.2, 1.5.1

Note: On Addressables version 1.1.10, building for content update automatically deletes the old bundle.