Append Queries not bringing data from extra column

I'm having an issue where, when I try to append two queries, the additional column from the second query is in the combined query, but all records are null.

For example:

Query A:

ID          Column1          Column2

1             aaa                   bbb

2             ccc                    ddd

Query B:

ID          Column1          Column2          Column3

3            eee                   fff                     ggg

4            hhh                   jjj                      kkk

Appending Query B to Query A should result in:

ID          Column1          Column2          Column3

1             aaa                   bbb                 null

2             ccc                    ddd                null

3            eee                   fff                     ggg

4            hhh                   jjj                      kkk

However, I'm getting this:

ID          Column1          Column2          Column3

1             aaa                   bbb                 null

2             ccc                    ddd                null

3            eee                   fff                     null

4            hhh                   jjj                     null

I'm using the ribbon buttons to do this.  Here is the code that is being auto-generated:

= Table.Combine({#"Table A", #"Table B"})

Can anyone explain why I'm getting all nulls for Column3?

Thanks in advance for your help!