Tallbirds are not in world generation settings

There are two issues with Tallbirds currently when generating worlds:

1. Tallbirds/Tallbird Nests are not found World Settings/Generation, meaning there is no way to increase the spawn/nests of Tallbirds in the world respectively.

2. When generating worlds there is a chance for no Tallbird Nests to be generated in the worlds as seen in the image below, in a world with no world changes/ world mods.

Is there a chance Tallbird Nests could be retrofitted into worlds, since there is a chance players could not get them, Thank You