How to restart Omnisharp server through NeoVim?

I have Omnisharp server running through native NeoVim LSP, here’s the config:

require'lspconfig'.omnisharp.setup {
    -- Use current directory for .csx files, search for .csproj or .sln otherwise
    root_dir = function(file, _)
        if file:sub(-#".csx") == ".csx" then
            return util.path.dirname(file)
        return util.root_pattern("*.sln")(file) or util.root_pattern("*.csproj")(file)

    capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities()),
    on_attach = function(client, bufnr)
        vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
    cmd = { "/home/llaz/bin/omnisharp/OmniSharp", "--languageserver" , "--hostPID", tostring(pid) },
    enable_editorconfig_support = true,
    enable_roslyn_analyzers = true,
    enable_import_completion = true,

It works fine, but I cannot seem to be able to restart the server neither using the LspRestart nor LspStop followed by LspStart.

I’m working with source generators and whenever a new type is being generated I need to restart Omnisharp for autocomplete to pick up the new type.

I have a feeling that there might be some configuration missing to somehow hook LspRestart onto omnisharp instance?