It worked immediately! Thank you so much!

Yes, the history repeats the notification payload as it naturally should. This means that Apple should actually re-issue the notifications with invalid payload. Not holding my breath for that. Without that I think the only way to return to stabile operations for the purchases affected is to implement the API workaround you describe.

There is another thread about this with just missing transactionInfo, might be same issue or different, see here https://developer.apple.com/forums/thread/723191