SQL Server users rejoice: QGIS now fully supports curved geometry types (and other "version 2" geometry fields)!
In past QGIS versions, the SQL Server provider would only handle version 1 type geometries, and could only show straight feature types. In 3.8, we've added full support for version 2 geometries. This change also allows full support for Z or M enabled geometry types! Additionally, we fixed several known issues with geography field types.
This feature was developed by Tamas Szekeres