在我的应用程序的最新更新中，我添加了CloudKit同步，现在有一个用户告诉我同步不起作用。他向我发送了他的设备日志，然后我发现了以下内容。我尝试搜索有关same batch didn't have chain PCS data on it for record错误消息的错误消息，但未找到任何内容。有人知道导致问题的原因吗？以及我该如何解决？
这是日志的一部分： （还有更多类似的行）
<CKError 0x2847f96b0: "Partial Failure" (2/1011); "Failed to modify some records"; partial errors: {
E3025D29-4C92-46EE-AB90-9C821B7B5824:(xxx:__defaultOwner__) = <CKError 0x2847fbed0: "Internal Error" (1/5001); "Parent record <CKRecordID: 0x104fb0c60; recordName=CF722F9C-6324-4164-82EB-8C9A1DA472CD, zoneID=xxx:__defaultOwner__> in the same batch didn't have chain PCS data on it for record <CKRecordID: 0x104fb0910; recordName=E3025D29-4C92-46EE-AB90-9C821B7B5824, zoneID=xxx:__defaultOwner__>">
27D87174-F296-4BEE-9C20-66CB040EF8B3:(xxx:__defaultOwner__) = <CKError 0x281b5d4a0: "Internal Error" (1/5001); "Parent record <CKRecordID: 0x104f522b0; recordName=CF722F9C-6324-4164-82EB-8C9A1DA472CD, zoneID=xxx:__defaultOwner__> in the same batch didn't have chain PCS data on it for record <CKRecordID: 0x104f04360; recordName=27D87174-F296-4BEE-9C20-66CB040EF8B3, zoneID=xxx:__defaultOwner__>">