Hi,
I believe the issue has occurred post version 2.1 and has started to occur from version 2.2 onward.
Here is a documentation for ArcGIS Pro's Smooth Line tool:
- "Prior to the ArcGIS Pro 2.2 version of this tool, topological errors could be generated during processing. The Handling Topological Errors (error_option in Python) and Preserve endpoint for rings (endpoint_option in Python) parameters were used to identify these errors. These parameters are still included in the tool's syntax for compatibility in scripts and models but are now ignored and are hidden from the tool's dialog box."
- https://pro.arcgis.com/en/pro-app/tool-reference/cartography/smooth-line.htm
ArcGIS Pro's Smooth Line tool on version 2.1:
ArcGIS Pro's Smooth Line tool on version 2.2.3:
Do notice the difference in the Smooth Line tool's options in ArcGIS Pro 2.1 and ArcGIS Pro 2.2 onward. Specifically the 'Preserve Endpoint for closed lines' and 'Handling Topological Errors'.
Here is ArcMap's Smooth Line tool with the options:
Thanks.
Regards,
Klint