MacOS 10.14. Intel HD Graphics 530 1536 MB
Broken: 2.8 hash 642fe9e0f2a95 Nov 4
Short description of error
If one sets up custom normals on a mesh and then modifies them, and enables loop normals in the overlay options, then the displayed normals stay at whatever the loop normals would be just for the face that the loop is for.
Exact steps for others to reproduce the error
was made by setting autosmooth on the cube, making the top edges sharp, setting the object to smooth shading, then using alt-L to enter normal editing mode, then using m (point at mouse) and moving the mouse a bit, and then left clicking. The matcap shows that normals are affected when doing this.
The commit 478899dee771 appears to have added loop normal display support so I'll assign to fclem but maybe the problem is due to a number of TODOs in draw_cache_impl_mesh.c about "real loop normals".