Recently I have upgraded my Alteryx software to Ver 2021.3.2 and then onwards I am facing an issue with duplicate / missing column name error in Select tool (Please refer attachments for version and issue). Whenever we do add a new column or make some changes in the existing workflow, Select tool automatically duplicates and missing's columns randomly. Currently as a work around we are adding a new select tool to overcome it. However this is very tedious and time consuming task as we need to manually see which of the columns were selected for next processing. Same issue is happening with Join tool also.