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This is the offical Arch package. I'm using the (unofficial) AUR haskell-language-server-bin which just downloads the linux build from the official github repo
I'm working my way through the haskell fp-course fork that uses stack.
I think this is a problem with haskell language server. Also, there seems to be something missing in lsp-haskell indicated by the null errors but most likely it is not related to code actions. It is best to open an issue in https://github.com/emacs-lsp/lsp-haskell .