Reproduction steps:
1. Open the attached project.
2. Open the "Main" scene.
3. Make sure that game view windows is big enough to see the button.
4. Open "Window > Profiler".
5. Enable "Deep profile".
6. Click the button mentioned in step 3 a several times.
7. Pause the scene.
8. Scroll through the profiler until you find "SetupCoroutine.InvokeMoveNext() > <Start>c_Iterator0.MoveNext() > ColorTween.TweenValue()"
9. Allocation varies between 30 and 1100 bytes on every button press(image1.png).