When creating HR Lifecycle Events Cases via the New Hire Onboarding Record Producer, HR Lifecycle Events Cases are duplicating seemingly endlessly until the transactions die out.
The issue is that there is a custom Script inside of the Record Producer (RP).
As soon as the custom Script is removed, the behavior ceases. When it is added back, the behavior reproduces readily.
Therefore, to resolve the issue, the custom Script needs to be removed from the New Hire Onboarding RP.