AFAIK - not very common.Anyone else have a failure like this? Trigger went dead at the range during my last session. The little hook broke off. I have close to 10k on the gun. I had a spare so no big deal, but was curious if it's common???
Suggestion - send this picture and explanation to Glock. They might send you something?
ETA: I also noticed that your spring rod and bearing does not have the correct orientation in your picture (maybe this got moved after removal?).
Refer to the illustrated small circled picture from Glock Armorer's Manual:
I remember at my last Glock Armorer's recertification that the instructor mentioned that the orientation is important.