Broken roof tiles on new roof

The builders have just laid the tiles on out new kitchen extn roof and looking out from the upstairs bedroom window, I can see about 4 roof tiles that have the corners broken off (about an inch or two off the corner of each).

Is it likely to cause a problem down the line? or is this normal? Should I insist that they replace them?

I haven't said a word yet- just want to get my facts straight first.

rrrrrrrrrr said:

... or is this normal? Should I insist that they replace them? ...

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Yes its normal for some builders to try install broken stuff, "Bu' dey were delivered da way!", is a famous excuse I got.

Yes, insist they are replaced.