View Object Extensions failing after upgrading to 12.1.3

We extended some VOs on pages to add data and personalized the page to add an attribute to display the data.  After upgrading to 12.1.3, all of these pages are throwing index errors when navigating to them:

JBO-27022: Failed to load value at index 52

Do we need to regenerate all of our VO extensions/substitutions?  I thought by using the approved extension process that these would survive upgrades/patches.  We extended the VO and loaded the new VO via a substitution.  We then personalized the page to add the new attribute.

Thanks.