Lihzahrd Brick Wall

The biome is not the shape of the building, it is the background. Stand in front of the original wall and the music changes and the temple's own residents start appearing on the brick. Which means the entrance is live long before you are meant to be there. Wandering in during pre-hardmode for a look around gets you killed by something you have no answer to yet.

Two things you would normally rely on stop working near the untouched wall. The Rod of Discord refuses to drop you into any underground spot backed by it until Plantera is down, and teleporters placed behind it will not fire either. It is a deliberate lock rather than a bug, and there is no route around it except the boss.

The version you place yourself is inert. It blocks spawns, counts for housing, and does nothing else, so it is decoration for a temple themed build. If you want the real thing, the shimmer conversion after Golem gives you a wall that carries the biome with it, which is how you build a temple enemy farm anywhere you like.