We are experiencing exactly the same problem.
Example: originalTransactionId: 440001375662781 initial buy date: 2023-03-03
We used Get notification history API to load notification history for particular originalTransactionId and renewals (DID_RENEW) notifications returned. Only INITIAL_BUY missing.
It means notification doesn't exist on App Store server (No network issue at all).
It's rarely but very frustrating. We don't know which notifications are missing. Please help.
WojtekKosak
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Lamk