Confusing `ghcup set` error

When I run ghcup set it doesn't seem to be able to find the versions of GHC installed. For example I have the following:

> ghcup install ghc-8.10.4
[ Warn  ] This is an old-style command for installing GHC. Use 'ghcup install ghc' instead.
[ Warn  ] GHC ver 8.10.4 already installed; if you really want to reinstall it, you may want to run 'ghcup rm ghc 8.10.4' first
> ghcup set ghc-8.10.4
[ Warn  ] This is an old-style command for setting GHC. Use 'ghcup set ghc' instead.
[ Error ] The version "ghc-8.10.4" of the tool "GHC" is not installed.

Any ideas what might be causing this? I also find the warnings very confusing since the commands shown are also on the gitlab readme.

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