You need to learn about the game development process. There's no possible way to catch every bug during development. Once a game releases hundreds of thousands of people are playing at once on different difficulties, different sliders, different playstyles.
A small group of testers can in no way possible catch every bug. And if a large enough group amd time was given to actually catch most of them then everyone would butch about buying a $100 or more priced game.

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