C# Queue compilation issue

Hello everyone,

I am currently attempting to use a queue as part of a monobehaviour. I am able to create the queue by referencing System.Collections.Generic as you would expect, however if I make an attempt to call Enqueue, Peek, or Dequeue I get the following error in Unity when compiling scripts (the solution compiles fine in visual studio):

For reference, the Queue I'm using is on unity 2019.3.0f3
private readonly Queue<AssetReference> _stateRequestQueue = new Queue<AssetReference>();

Is there something I'm missing here about using Queues in Unity?

 

Note:
This error only seems to happen when using the generic type Queue<T> using System.Collections.Queue seems to compile and run fine.

 

Getting same error on Unity 2019.3.10f1. Interestingly, the error appears only when I try to compile

Code (CSharp):

1. m_commandQueue.Enqueue(1);

member definition compiles fine:

Code (CSharp):

1. Queue<int> m_commandQueue = new Queue<int>();

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