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Crankshaft?
I'm not a mechanic or engineering minded in any way - I had a metallic clanging/rattle on mine (not wastegate at this point) when letting off throttle/decelerating and occasionally when blipping throttle.
Luckily car was still under warranty - took into Bmw (suspecting wastegate rattle as that was the only rattle info I could find online). Turns out it was the crankshaft - a bearing had spun or something. they didn't know why, put it down to oil starvation or just manufacturing defect. Sorted out under warranty thankfully.
Hopefully it's not that for you, again could be completely off the mark but this is my experience.
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