Originally posted by Chr!570ph3r:

Originally posted by pepe the krab:

yes worldgen was changed to increase the size of mistlands

Source? I haven't seen any patch notes about it.
When I confirmed old seed layout it was the same.

if you use the exploremap command you can see it for yourself. old seeds also use the outdated layout of the biome so its very important you make a new save if you wanna play it properly