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async Main doesn't work in Run mode

See original GitHub issue

I’ve tried to compile the following code:

using System;
using System.Threading.Tasks;
public static class Program {
    public static async Task Main() {
        Console.WriteLine("🌄");
    }
}

The compilation failed with an error:

Unbreakable.AssemblyGuardException: Type System.Runtime.CompilerServices.AsyncTaskMethodBuilder is not allowed.
   at Unbreakable.Internal.AssemblyValidator.EnsureAllowed(TypeReference type, String memberName)
   at Unbreakable.Internal.AssemblyValidator.ValidateMemberReference(MemberReference reference)
   at Unbreakable.Internal.AssemblyValidator.ValidateInstructionAndGetPolicy(Instruction instruction, MethodDefinition method)
   at Unbreakable.AssemblyGuard.ValidateAndRewriteMethod(MethodDefinition method, RuntimeGuardReferences guard, AssemblyValidator validator, AssemblyGuardSettings settings)
   at Unbreakable.AssemblyGuard.ValidateAndRewriteType(TypeDefinition type, RuntimeGuardReferences guard, AssemblyValidator validator, AssemblyGuardSettings settings)
   at Unbreakable.AssemblyGuard.ValidateAndRewriteType(TypeDefinition type, RuntimeGuardReferences guard, AssemblyValidator validator, AssemblyGuardSettings settings)
   at Unbreakable.AssemblyGuard.Rewrite(AssemblyDefinition assembly, AssemblyGuardSettings settings)
   at SharpLab.Server.Execution.Executor.Execute(Stream assemblyStream, Stream symbolStream, IWorkSession session)
   at SharpLab.Server.MirrorSharp.SlowUpdate.<ProcessAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MirrorSharp.Internal.Handlers.SlowUpdateHandler.<ExecuteAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at MirrorSharp.Internal.Connection.<ReceiveAndProcessInternalAsync>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MirrorSharp.Internal.Connection.<ReceiveAndProcessAsync>d__12.MoveNext()