Answering my own question, in case it's useful to someone else. It needed wrapping in a MeshMaterial2d like so. 
Any Bevy experts on here? I'm trying to upgrade my project from 0.14.2 to 0.15.2 and there's a change that breaks:
commands
.entity(entity)
.insert(map.highlighted_material.clone_weak());
where map.highlighted_material is a Handle
#rustlang #rust #bevy
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