Small chunks plaster in pump basket

Our gunite pool was finished 3 months ago and a couple of times I’d have seen small chunks of plaster in the pump basket. Most have only been 1/8 inch in diameter. This evening one is in there that is about 3/4 inch long and about 1/8 inch wide.

Has anybody else had this happen? Am wondering if it is just left over around the main drains under the plastic cover or something more damaging.

Thanks in advance