Let's not jump to conclusions prematurely. I had opened the Pro1-X multiple times, so I cannot exclude that I broke these contacts off myself. One I definitely did, as noted above. That's also the reason why I did not try to make a warranty claim out of this.
Then again, two of the connectors seem to really have disappeared, so maybe they were missing from the start indeed. For sure the Pro1-X had its connection issues since the first time I put a SIM in it.
Lets see if others affected by the issue find the courage to open their devices, and discover similar problems.
Indeed,