I’ve heard that the patch should look like ribbons - much like the paper “grass” you see in Easter baskets etc.
Some of my rifles produce fragments like that which I take as confirmation that I’m doing at least one thing right!

I suppose that the type of rifling has much to do with how your patch will look as well.
I used to think that the rifling cut the patch but in using Metford rifled guns which also result in ribbon like patch fragments, I think what is really happening is the same as when you fold a piece of paper and then tear it along the fold.
The rifling is impressing and maybe thinning the paper so when it exits the muzzle, air flow tears the paper along the impression making ribbons that are more or less a match to the rifling.

Maybe some day I’ll get to the range with rifles which have different forms of rifling to do a comparison.