However - it is possible to select the Throughout the Ages gameplay template but then have a different world generator selected. This happens for instance if you pick the template, then go look at the module screen. Even if you change nothing if you go back the world generator usually resets to something like "Flat"
If you end up with the "Perlin" world you get trees, but the basic type with just trunk and leaves, no branches. And other parts of the world go wonky too
Also, moving thread to Support, since it is fairly on-topic