In reply to pass and peak:
Saw on another forum in not that long ago, the guy bought one from Decathlon, and from further communication with them, they said it was the first time they heard and that only that one in the store that had been incorrectly assembled. Probably (at least I hope!) Simond found out just from that. So I would say it is pretty rare, but definitely check if you got some!
And yes, Simond / Decathlon do seem to rely on Google Translate exclusively for their non-French websites and comms
It's exactly as you wrote - some of them had been assembled with the locking collar reversed, not screwing all the way. Simple to check and pretty obvious. The flared part of the collar should be near the keylock (and obvs. cover it when locked), in some it's the other way around.
Post edited at 14:02