:doc command does not work on ghc boot libraries with ghc-8.6.4

In the GHC 8.6.4, GHCi's :doc command does not work on ghc boot libraries, such as GHC.Base.
Perhaps boot libraries of GHC 8.6.4 were compiled without the -haddock option.

At least, it occurs in linux and windows binaries of GHC 8.6.4:

The error messages are as follows:

ghci> :doc id
ghc: Can't find any documentation for GHC.Base.
This is probably because the module was compiled without '-haddock',
but it's also possible that the module contains no documentation.

Try re-compiling with '-haddock'.

ghci> import Control.Monad.State
ghci> :doc State
ghc: Can't find any documentation for Control.Monad.Trans.State.Lazy.
This is probably because the module was compiled without '-haddock',
but it's also possible that the module contains no documentation.

Try re-compiling with '-haddock'.

Previous version of GHCi (ghc 8.6.3) could perform :doc command as follows.

ghci> :doc id
 Identity function.

 > id x = x

ghci> import Control.Monad.State
ghci> :doc State
 A state monad parameterized by the type @s@ of the state to carry.

 The 'return' function leaves the state unchanged, while @>>=@ uses
 the final state of the first computation as the initial state of
 the second.

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