Thank you very much for your help, when I was troubleshooting com.apple.developer.ubiquity-kvstore-identifier, I realized that both App and Widget use CFBundleIdentifier, but the CFBundleIdentifier of App and Widget is different, which leads to the value of com.apple.developer.ubiquity-kvstore-identifier is not the same, so the key-value storage of iCloud is not the same.
com.apple.developer.ubiquity-kvstore-identifier
$(TeamIdentifierPrefix)$(CFBundleIdentifier)
paisleyy
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