You don't say if that's once fired stuff or reloaded several times but the cracks occur because the necks are too hard ("brittle"), not because of the pressure and very rarely directly because of the chamber itself.
It's just disposable factory brass & NOT reloading brass.
No big deal, just throw it away after use.
Go to any Red Communist China Walmart and have em pull a box of remington ammo. Slide em out of the box & you can find one or two(easily) that will obviously split on firing. You might even find one or two among several boxes that are already split..