To reproduce:
1. Open the QA attached project "1200639.zip"
2. Press play
3. Check the console for errors

Actual result: Exception of type 'UnityEngine.AddressableAssets.InvalidKeyException'
Expected result: there should be no exceptions

Reproduced on: 2018.4.14f1; 2020.1.0a15
Can not reproduce on 2017.4, no package manager
Introduced in: Addressable package 1.3.3 and newer

Error:
Exception encountered in operation UnityEngine.AddressableAssets.Initialization.InitializationOperation, result='', status='Failed' - Chain<Int64>: ChainOperation of Type: System.Int64 failed because dependent operation failed
Exception of type 'UnityEngine.AddressableAssets.InvalidKeyException' was thrown., Key=someName
UnityEngine.ResourceManagement.ChainOperationTypelessDepedency`1:OnWrappedCompleted(AsyncOperationHandle`1)
DelegateList`1:Invoke(AsyncOperationHandle`1) (at Library/PackageCache/com.unity.addressables@1.4.0/Runtime/ResourceManager/Util/DelegateList.cs:69)
UnityEngine.ResourceManagement.ResourceManager:Update(Single)

Code:
void Start()
{
try {
Addressables.GetDownloadSizeAsync("someName").Completed +=DownloadSizeResult;
}
catch (Exception ex)
{
Debug.Log("GetDownloadSizeAsync error: " + ex.Message);
}
}
private void DownloadSizeResult(AsyncOperationHandle<long> obj)
{
if (obj.Status == AsyncOperationStatus.Succeeded)
{
Debug.Log("DownloadSizeResult success");
}
}