Receive LocalVariableNotDiposed when field is not disposed

[BADF00D]

Prerequisites

• [x] I have written a descriptive issue title
• [x] I have verified that I am running the latest version of DisposableFixer: 1.6.0
• [x] I have searched open and closed issues to ensure it has not already been reported

Description

When I assign a field/property via await Expression, I get a local variable not disposed, but I should get an field not disposed.

Source Code

namespace SomeNamespace
{
    public class SomeClass
    {
        private MemoryStream _mem;

        public async Task Do()
        {
            _mem = await Create();
        }
        public Task<MemoryStream> Create()
        {
            return Task.FromResult(new MemoryStream());
        }
    }
}

Screenshot

[BADF00D]

Version with property.

namespace SomeNamespace
{
    public class SomeClass
    {
        private MemoryStream Mem { get; set; }

        public async Task Do()
        {
            Mem = await Create();
        }
        public Task<MemoryStream> Create()
        {
            return Task.FromResult(new MemoryStream());
        }
    }
}

Screenshot: