I should also clarify that having just the first one alone "test1@1" = 1 works just fine.

Yes, I have tried all of those options. All result in a new layer with all values = NaN.

The created raster on mine only has undefined values, so nothing shows up. It might be an issue of versions. I have the latest version (Wien) and it looks like you are running Lyon. I can't find any bug reports of this particular issue online though.