Ok, I see now what you were intending here.

As you mention, not having bridge + tunnel combo is preferable, yes, but not a hard requirement, because there are certainly examples that are ambiguous and someone on the ground would describe it as either.

In this case, going through this, it certainly looks like a tunnel with enclosed walls: https://www.mapillary.com/app/?pKey=1162385845010436&focus=photo

While going above this, it certainly looks like a bridge all the way: https://www.mapillary.com/app/?pKey=9296438897071859&focus=photo

This is one of those really old and odd Soviet space-constrained structures built a certain way with certain materials. Nowadays, you would have individual supports instead of solid "walls", more like this: https://www.mapillary.com/app/?pKey=1141158633859299&focus=photo