A MSAA depth buffer shows up in the "OM Depth Buffer" tab as all black in 2.3 (all white in 2.2), with D:0 in the status bar even where triangles were written. Also, the resolve and sample tabs are disabled.
In a latter call, when the resource is bound as a SRV, it is displayed correctly in the "PS Texture #" tab in 2.2, but in 2.3 it still shows as all zero.