It's normal. High performance brakes. You're in the abrasive mode of friction. Bed in will put the brakes into adherent friction mode but regular street driving will put ya right back into abrasive mode. Arpad got you hooked up. But the GM procedure is a little excessive. Read this then watch the below video.
www.centricparts.com/media/wysiwyg/technical-bulletins/TECH_BULLETIN_C22-01.pdf
Watch this for the best info on bed in:
https://youtu.be/pdPX6rzuINc?si=iRynEgwQSfl775Ye
Embrace the squeal. #becauseracecar.