The Reshape tool results into different z-values when reshaping a circular arc segment in ArcGIS Pro.

Workaround

There are two alternative tools that may work for some scenarios:

1. The Edit Vertices tool changes segment to circular arc context menu item and reposition arc.
2. The Replace Geometry tool uses a line's construction tool to snap to vertices for straight segments and uses arc constructor to snap to vertices for required circular arc segments.

Steps to Reproduce