What makes the Chinese look even worse in this, is that this video was released in the first place. It suggests quite a number of things:
1. The defect wasn't detected in prototyping, or alternately that the prototypes were up to spec, but the mass production run is not.
2. The problem wasn't recognized when the new weapons started to be issued.
3. The basic infantrymen and infantry officers either lack the ability to realize this is a problem, or there's too much political weight behind the manufacturer for it to have been addressed.
4. Whoever recorded this video did not recognize that this was a problem.
5. Whoever among the CCP's higher-ups that was shown this video did not recognize this was a problem.
6. Possibly in a best-case scenario for the CCP, someone did recognize this was a problem, and this was supposed to be buried, but it was leaked. This is very unlikely given all the other shit that slips past them.
To give some perspective on the sheer level of incompetence this demonstrates on the part of the PLA, this is a problem that somewhere between a quarter and a half of random US Citizens would be able to recognize on-sight, and the CCP
has failed to do so.
Maybe by this point they have started to address the problem, and to be fair, once the problem is recognized, it's not like they have to redesign the whole rifle. They just have to fix the problems at the factory. Of course, given the CCP's utterly pervasive problems with quality control and corruption, even once they recognize the problem, there's a very real chance nothing will be done.