Getting Invalid Cell Reference after LeftAnti merge

I recently upgraded to Power BI Desktop Version: 2.59.5135.421 64-bit (June, 2018)

I have a large table (30K lines) with a few lines I needed to correct, so I copied the offending lines to a new Excel file, did a left Anti merge to remove them from my large table, then merged the corrections back into the data table.

Last month this worked like charm.

Now I get "DataFormat.Error: Invalid cell value '#REF!'." when doing the merge with JoinKind.LeftAnti.

Neither of the original Excel tables have any formulas or any cell with a #REF! error. 

If I do a RightAnti I get a table which I can expand, but I get an empty table when I expand the data.

To clarify: This is all in Power Query

If I do an InnerJoin I get the rows in my Corrections file and I can expand things just fine.

If I do a RightOuter join I get the same behavior as InnerJoin.

Any suggestions on getting LeftAnti joins to work in the June 2018 version?