piece of foundation broken off.

I am building my first house and it is all framed awaiting stucco but I noticed a chunk of the top of the foundation had broken off like something had maybe banged into it. It is a chunk about 6 inches wide and about 3 inches deep and I can see some of the rebar. The builder said they would patch it and it would be good as new. Is that something to worry about? Thanks!!!
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