They break all the time. I wish I could say they all came from the dealer like that but they don't. They crack in the cold, from rough roads, hitting curbs, even just walking past them too fast or talking to loud will cause them to crack. They don't need ever single tab to hold on. I've got a bunch of cars with lots of the tabs broken. They fly off so often some of our cars just run without them.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)