Merge pull request #2912 from FernandoS27/async-fixes

General fixes to Async GPU

src/core/core.cpp

@@ -256,6 +256,8 @@ struct System::Impl {
         is_powered_on = false;
         exit_lock = false;
 
+        gpu_core->WaitIdle();
+
         // Shutdown emulation session
         renderer.reset();
         GDBStub::Shutdown();