Well, from what I actually found out, is that missing bit of the slide catch notch doesn't impact performance, instead that slide catch is the one to blame, and since it's slightly bend, it seems it goes a bit close to slide rails it doesn't go to the notch perfectly since it was bent.I tested it, When I tried to lock the slide, it didn't locked, so I put some light on and inspected what was going on, so it was basically as I said before, the slide catch goes a bit too close to the slide so when press the slide catch upwards in order to lock it, it seems to get stuck, so what I did is that I simply locked the slide completely to the rear and pressed the slide catch a bit further outwards and it the slide locked completely.
https://imgur.com/a/KcJ6IJY