Hi see there has been a topic on this where it was stated to be fixed, but not sure.
When I try the Joiner node in KAP 5.2.6, the columns when duplicated no longer number the columns. Not sure why functionality would be removed from nodes as that prevents easy adoption of newer nodes and makes it much more difficult to migrate workflows away from deprecated nodes.
Internal ticket AP-21776
Fix version(s): 4.7.9, 5.0.1, 5.1.4, 5.2.4, 5.3.0
But it seems it is not so for 5.2.6.
Any idea why or am I missing a naming convection that would number columns instead of just adding the suffix at the end of the column names.