Instead of adding a new map with a new biome, why not just add it to people's private worlds?
Since not everyone in the game would have access to a tech web from it, only have them be filled with decoratory items.
For example, bring back the desert biome surroundings as well as cacti and terrain blocks, but also add other small things specified to the map like block reskins, new gnomes/wildlife, etc.
With this update, other biomes could get minor updates like fallen leaves, snow piles, sandcastles, just small little decoratory blocks to add more character and life to maps!
Almost a nice little way to bring the desert biome stuff back while also opening a new door of opportunities for things like caves, cities and many more, as well as potentially adding new things to old tech webs