Upgrading to 2021.1.11 with Unity integration: WwiseEventReference instances broken?

Question

We upgraded our Wwise from 2019.1.1.6977 to 2021.1.11.7933 and I noticed that the Unity asset type WwiseEventReference changed from being a Monobehaviour to a ScriptableObject. However after the upgrade, I noticed that the old Monobehaviour instances (in Assets/Wwise/Resources/Event/) were never migrated to ScriptableObject instances and as a result, all of our AkEvent prefab instances now point to invalid data. Was there a step in the upgrade process that failed? If so, is there a script we can run to manually fix up those instances types and the references to them?