Shaded view bug - Multi-colored subsurfed boobs

So I’m making these breasts and every time I exit edit mode Blender will crash or this will happen. Anyone encountered this before? The left is a mirrored linked duplicate and the anomoly goes away when I select it and recalculate normals on that side.

I suspect this has something to do with being in textured view with a toon shader.

It’s gotta be a problem with textured view, stopped crashing when I turned it off, started again when I turned it on.

That’s “Shaded” view with toon rendering.