Combining ?. operator with extension method and generics

[persn]

Consider the following piece of code

    internal partial class TestZomp
    {
        [Zomp.SyncMethodGenerator.CreateSyncVersion]
        public async Task Foo1Async()
        {
            _ = Singleton.Foo?.Get<string>();
            await Task.Delay(100);
        }
    }

    internal class Singleton
    {
        public static Foo Foo { get; set; }
    }

    internal class Foo {}

    internal static class FooExtensions
    {
        public static T Get<T>(this Foo foo) => default;
    }

It generates

        public void Foo1()
        {
            _ = ((global::System.Func<global::Sandbox.Foo?,string?>)((param)=>(object?)param == null ? (string?)null : global::Sandbox.FooExtensions.Get(param)))(global::Sandbox.Singleton.Foo);
            global::System.Threading.Thread.Sleep(100);
        }

Which fails because <string> is missing for the Get call

error CS0411: The type arguments for method 'FooExtensions.Get<T>(Foo)' cannot be inferred from the usage. Try specifying the type arguments explicitly.