System: Win 64
Blender: 2.8 - latest daily build (10 January)
Short description of error
on curve object. curve.data.users property will be increased by one incorrectly, even though generated mesh type of data should not affect selected curve data count.
Object.to_mesh() works ok with mesh objects ('users' count property is not increased)
Simple blend file with curve and command: C.active_object.to_mesh(C.depsgraph, True). Mesh is generated ok, but curve.data.count is bigger:
After restart the user count it back to correct value of 1.