The thing is nothing is stopping them from ignoring the treaty and just doing the restoration anyway; no one is going to embargo or declare war on France over medieval architecture
And especially not if done for the entirely reasonable reason of "The wood burned the last time, so this time we're not going to rebuild the internal parts out of wood."
It's also less clear that this treaty applies to rebuilding work; the original intent appears to be preventing unnecessary changes.
It's also less clear that this treaty applies to rebuilding work; the original intent appears to be preventing unnecessary changes.