Cryptomatte Aliasing and Artifacting Issue

Not sure I have found a great solution or answer to this problem yet. But does anyone know how to avoid aliasing in cryptomatte? I rendered this test as an OpenEXR without compression and can’t seem to figure out what I need to do to get rid of the harsh edges.

Does the produced matte also have aliasing? What you see here is a visual representation for user to make sense of objects (usually for picking them), actual matte is decoded not from color data you see but whole channel set cryptomatte uses.