Hi,
As far as I know, you should extend the gear manually only with the gear lever in OFF position. And that works fine. (Of course everything without SYSTEM A pressure)
I played a little bit around and if you extend the gear manually while the lever is in DOWN position the gear will not extend but the sound will play. If you then select GEAR UP the gear will drop down.
I am not quite sure but it seems a bit strange to me:
If you don't understand pls watch the video below!
I hope it's not a double report.
But keep it up guys, your plane is amazing!