Facing below error when saving workflow in gallery after server upgradation. Also when open new tab and copy workflow there and save then it will be saved.
I think it is best for you to contact the Alteryx Support in order to get your issue fixed. What version is the Designer on your server vis-a-vis with your on-prem Designer?
Also, can you give the error logs as part of the findings + your Alteryx versions (both Designer on-prem and Server).