Past events arrives in webhooks

Hello, 

we experienced recently, that INITIAL_PURCHASE webhook was sent just at 2024-11-01 wenn he opened the app, despite the actual event already happend at 2022-10-22

We implemented RevenueCat (onboarding script) in app after two years of using own solution for IAP. 

So is this proper behaviour, when submission was made way before RC was implemented ? 

Thank you very much for info.

Michal