`copy_hash` does not copy the commit hash to the default `"` register

[jecaro]

I've tried to copy a hash from :DiffviewFileHistory, using the key y. Then I wanted to use it in a new command :DiffviewOpen <yanked-hash>^!. So I pasted it in the command line using <CTRL-R-0> but I was surprised not to see the copied hash but something completely different.

It is because the hash is copied to the + register. Then one must use <CTRL-R-+> instead.

This is going against neovim defaults. Any good reason for not using the default unnamed register " for this?