I would not be concerned. It is a piece under some slight tension to hold it in place, and may well have just broke from fatigue ["old age"].
Tom Heller [Lugerdoc here on the forum] should have those pins in stock. If not, I just noticed today that Apex has them. I was surprised that Apex had any Luger parts, but live & learn.
It's interesting that it somehow jammed the sear/action. Maybe it got stuck under the trigger lever???