Here's the stack overflow explaining the problem and the answer: https://stackoverflow.com/questions/67324651/why-do-diffable-datasources-treat-class-and-struct-types-differently Need to inherit from NSObject and override isEqual(_ object: Any?) -> Bool and var hash: Int

This still doesn't work on an Apple Watch. Anyone have an actual solution? Why would it not work on the device but it does on the simulator?