Feedback [BUG?] AsyncOperationBase<T>.Task - invalid cast

Situation:
- I have an AsyncOperationHandle<IList<Object>>.
- I wanted to expose it as public property to await and track progress, but w/o having access to the results. So naturally I just exposed it as AsyncOperationHandle (non-generic version).
- Calling code gets this object and accesses Task property.
- AsyncOperationHandle.Task calls AsyncOperationBase<T>.Task, but here's an issue:

Code (CSharp):

1.         System.Threading.Tasks.Task<object> IAsyncOperation.Task
2.         {
3.             get
4.             {
5.                 return Task as System.Threading.Tasks.Task<object>;
6.             }
7.         }

Task is

System.Threading.Tasks.Task<TObject>

and this cast is incorrect, it won't down-cast generic class with another generic class with base class argument. It'll just always return null, resulting in an NullReferenceException.

 

Create case 1243070.

 

Today I've stumbled upon this bug again, now in a different context. If you try awaiting the result of

DownloadDependenciesAsync

, you get this error.

Here's a super easy reproduction step:

Code (CSharp):

1. await Addressables.DownloadDependenciesAsync("asset").Task;

This will result in NRE in all cases. Because

DownloadDependenciesAsync

returns non-generic AsyncOperationHandle, but internal operation has generic Task instance. As a result, Task is always null when using this function.

PS: if anyone wondering, the ticket I've created in April still hanging there. First they asked me for a "reproduction" project even though the bug is clear and no reproduction is needed. Then they've closed my case altogether. I've sent more replies of course so the ticket gets re-opened, but still no response. If only they could reduce the amount bureaucracy in QA department and just accept bugs that are already reproduced, identified in the code and explained...