Omnisharp is not able to autocomplete for any files in the same solution unless the referenced file is opened in a new buffer.
Notes: Running :LspInfo shows the correct root directory; Neovim version is 0.5
The error is The type or namespace name 'ClassName' could not be found (are you missing a using directive or an assembly reference?)
My neovim config files are https://github.com/SleepySwords/dotfiles/blob/master/nvim/init.vim
And my LSP config is https://github.com/SleepySwords/dotfiles/blob/master/nvim/lsp.lua