My latest update:I took mine into the dealer yesterday and they sprayed it to ‘fix it’. Would be really interested if Mazda have an actual fix (and what it is)
Better result than the software upgrade which it was booked in for. Went to pick the car up at the end of the day only to be told that they hadn’t been able to upgrade the software due to not having the right part (which they have now had to order!)
My dealer is saying that the fix previously implemented on my car (padding between the glass window and the door frame) was "the Mazda fix" but it clearly doesn't resolve the issue. My dealer has confirmed that they can hear the rattle. The problem goes away briefly whenever the rear doors are opened but this provides only a temporary respite. The issue is now with Mazda Europe.
My dealer installed the software update to solve the 12V battery issue - there was no mention of any new part required. Prior to my visit the MyMazda app had reported a problem with the lighting system (headlights, side lights, rear lights, reversing light etc). The dealer said that this false report issue was known to Mazda and the dealer thinks that the software update will also resolve this false reporting issue.