"Unrecognized field hyperlink-source" despite being in the default config

[HeladoDeBrownie]

Describe the bug
the default cabal-install config mentions an option under haddock called hyperlink-source, but if I uncomment it then it gives Unrecognized field hyperlink-source

To Reproduce

• [re]move any existing ~/.cabal/config file
• run cabal user-config init
• uncomment the line -- hyperlink-source: False in the generated config
• run cabal user-config diff

Expected behavior
the default config shouldn't include options that aren't recognized

System information

• arch linux, kernel version 6.17.9-arch1-1
• cabal-install 3.16.0.0 and ghc 9.12.2, both fetched using ghcup 0.1.50.2

Additional context
i was playing with the options because i noticed that libraries i get from hackage didn't have their source code pages generated when i used cabal haddock-project