Hi, just got my wife's 1299 out of the shop because of the same issue. A little bit of knocking is normal, but when it is as loud as WiZz and hers then there is a problem. Luckily it has now been solved. The clutch was quiet in neutral before she got a replacement motor, after that it was knocking like crazy, especially when warm. Ducati took the clutch apart today and found a small dent in the throw out bearing (see diagram part 10). Manufacturing defekt, they say. They replaced it and now it's fine. Only takes about 20min to replace, so it's not a major fix. Hope this info helps, cheers from Ty.