Apparently The Digital Bits is reporting that Paramount is doing a disc replacement program for RB.
https://phe-physical-consumer-suppor...ymHcj498V_Xx5Y
Select, "other" for the issue type, put "Rosemary's Baby 4K Ultra UHD" in the title field and in the description box, put "replacement disc". You'll need to provide proof of purchase and the discs will be sent when they're ready in the next couple of months.