Probably happened during machining, as long as no loose bits it will be fine
I've removed the potentially loose bits and the debris I made in the process. I used to have a selection (3) of bearing scrapers from back in the day when you hand finished white metal bearings probably on the likes of an Austin 7 - they were my late fathers from when he worked for RR /Bentley at Crewe in the 1940's. They had rusted a little over the decades so about 20 years ago I threw them away - would have been an ideal tool. Last used by me to free off a set of camshaft bearings in an A series engine circa 1967.
Oh the things I gave away or threw away over the decades that I could use now - of course that was safe in the knowledge that I would never need them again - how wrong I was - I understand Hoarders now. lol