The answer to your question is present in the error: "Validation error missing attribute values on mandatory destination attribute."
You've previously saved some models with a prior version of a Schema that did not have the isApero attribute and in the latest version of the model, you've added that attribute as non-optional. You should check out [VersionedSchema] (https://developer.apple.com/documentation/swiftdata/versionedschema) and SchemaMigrationPlan
davidstites
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This issue should be resolved on the latest betas. Please file a feedback report if it is not.