Bundled library haddocks don't have source links on instances

Instance haddocks usually come with source links, for example https://hackage.haskell.org/package/binary-0.8.8.0/docs/Data-Binary.html#t:Get:

In the haddocks bundled with the GHC releases, these source links are not present:

https://downloads.haskell.org/ghc/9.0.1/docs/html/libraries/binary-0.8.8.0/Data-Binary-Get.html#t:Get

The source links are also missing from the base haddocks on Hackage: https://hackage.haskell.org/package/base-4.15.0.0/docs/Control-Applicative.html#t:WrappedMonad

This makes it unreasonably hard to find the instance definitions.