Yes, I’m an idiot, ask me how! Or, I was wrong: although Blender uses the Workbench renderer in Wireframe and Solid Viewport Shading, it uses Eevee in Material Preview. Still intended to be a less-resource-intensive previz that won’t exactly represent the final render, but if you’re rendering in Eevee, the discrepancies aren’t because the Material Preview uses Workbench.