Errors using Case Merge Premium after Winter '21 release of Salesforce

You have Case Merge Premium in an Org that was just upgraded to use the Winter '21 release of Salesforce and start to see errors when using the App.

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Title
Errors using Case Merge Premium after Winter '21 release of Salesforce
URL Name
Errors-using-Case-Merge-Premium-after-Winter-21-release-of-Salesforce