I’m afraid this issue is in Groove Agent itself and it has to be fixed by Steinberg. But Groove Agent 4 is not in the development anymore, so it will not be fixed for Groove Agent 4.
Hopefully it has been fixed for Groove Agent 5.0.20 already.
Or if Groove Agent SE is good enough for you, you can update your Cubase to the current Cubase 10.5. You will get Groove Agent SE 5 with. You can also download Cubase 10.5 Trial here.