I experienced the same issue. I have been using a checking account transaction register report for many months and it has always had the same columns.  Today after being warned that there's a critical update, I installed the latest version.  The same report that I used in the past has three new columns that aren't even checked in the customize report section.  And three columns that I used to have were unchecked, so I added them back.

The report that I have been using was a contributed report and I just tweaked it for my company file.  It was listed among the reports that I saved and ran recently.  I run this report after the end of every month so my auditor can match transactions in QB to my financial institution's statement.  I download the report to Excel where I use a macro to format it.  Of course the macro doesn't work when the columns are different.  So now I'm dealing with a workaround so I can give my auditor the correct information.  This is very frustrating.