Master pages updated
On SharePoint application, the application could not retrieve geo location. To resolve the issue, HorizontalMenu, VerticalMenu, and Blank master pages are replaced.
Migration effects
For SharePoint application only, HorizontalMenu, VerticalMenu, and Blank master pages are deleted during migration. When the application is built, these files are regenerated.
What you should do
After migration, re-apply any customizations you may have made to the original files.