Bug
D&D Beyond
as the title says you cant select any of the languages from 1985 games Obojima: tales from the tall grass aren't a option when picking languages in the character creator.
This should be in the release issues thread, not its own post. (And it is a valid issue, to note: Third party languages are available in the builder, as evidenced by Humblewood.)
Note that anything from 2024 listing Standard Languages will never list a third-party language as selectable, as they aren't standard languages, they're exotic.