MIgrated 3.4.7->4 Notification Settings seem to be random?

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After migration from 3.4.7 to 4.0 the Notification Defaults seem quite random and bear no resemblance to how I had them on 3.4.  Is this intended as a "new start" for notification settings or should they have been migrated where appropriate?  For example, half of them are now set to "Member can edit? : Disabled" and they were all enabled on my 3.4.7 board.