I read somewhere ages ago some theory that they built two of them and are keeping the real launch secret in case the rocket explodes. Wouldn't surprise me.
The Arianne is an exceptionally reliable rocket though.
If something goes wrong it will be some kind of deployment issue with the sunshade. If anything at all goes wrong it can't be fixed. We can't send astronauts to L2. Which also means JWST will have a much shorter lifespan than Hubble.
Iirc Hubble required repairs before it could be used.
It will be interesting to see what kind of eyes get built on the moon in a few decades. Assuming of course that Artemis continues and/or other nations like China keep momentum going.
Pretty sure the Saudis are building their first moon rover.