Tire Tread/belt problems of the 2016 Toyota Corolla

Purchased set of 4 cooper cs5 ultra touring 195/65r1591h tires on 26 Jun 2026 @ 48,847 miles on the odometer. Three of the tires had the same serial number of u9ae1cr2622, with the 4th of u9ae1cr4822. Brought car in for service on 20 oct 2025 @ 65,340 due to a slow leak on the rear passenger and was informed the rear passenger and front driver tires had tread separation and needed replacing. The tires both had a serial number of u9ae1cr2622. Tires were replaced. 15 Aug 2026, the front driver tire (the remaining tire with the u9ae1cr2622 serial number; it had been rotated to that position during the 20 oct 2025 service) the tire pressure indicator light came on and discovered a slight (~7 psi) drop and aired up to correct pressure. However the tread appears rounded as apposed to flat across like the other tires and have confirmed the tread has separated. The car is driven moderately on paved roads and does not sit for extended periods of times. The tread depth is still quite deep. I expected much more out of these tires and do not plan on buying cooper again. I believe the cooper cs5 ultra touring 195/65r1591h tires (and perhaps more specifically, the u9ae1cr2622 batch) is defective and dangerous.