How to make sprites unaffected by lighting?

I want to throw a couple of sprites into my game for tutorial purposes so I created the sprites based on their images and just dragged-and-dropped them into the scene so I have them as PaperSpriteActors in my hierarchy now. However, they are all affected by the lighting - when I have a dark decal in the level which makes everything darker, they become darker too - and I’d like them to stay equally as bright the whole time. I saw that they use TranslucentUnlitSpriteMaterial which has a parent of DefaultSpriteMaterial so I made sure that it was set to a masked blend mode and unlit shading model - but it does not help at all. How can I make these sprites not take lighting into account, then?