Apple iphone 11 pro , camera lens cracked

I bought my phone in november 2019.

used it for good 6-7 months. never dropped it , and used a protective cover always. one day i saw my camera lens crack , which appeared out of no where. it is 99% of the times in my pocket?

how is it even possible.

this is an expensive camera centered device and now i cannot use my main camera to take pictures since the lens is cracked.