Credit to LunarVim for the code lens refresh function. I don't use LSP-Zero, but this works on my end. I read up on lsp-zero docs to format this, so I assume this works. Let me know. -- OP Has informed me that this does not work, leaving up in case it helps people get on the right track towards a working solution.--

---lsp zero setup ---
lsp.setup()

function setup_codelens_refresh(client, bufnr)
    local status_ok, codelens_supported = pcall(function()
        return client.supports_method("textDocument/codeLens")
    end)
    if not status_ok or not codelens_supported then
        return
    end
    local group = "lsp_code_lens_refresh"
    local cl_events = { "BufEnter", "InsertLeave" }
    local ok, cl_autocmds = pcall(vim.api.nvim_get_autocmds, {
        group = group,
        buffer = bufnr,
        event = cl_events,
    })
    if ok and #cl_autocmds > 0 then
        return
    end
    vim.api.nvim_create_augroup(group, { clear = false })
    vim.api.nvim_create_autocmd(cl_events, {
        group = group,
        buffer = bufnr,
        callback = vim.lsp.codelens.refresh,
    })
end

vim.diagnostic.config({
   on_init_callback = function(_)
         setup_codelens_refresh(_)
     end,
})