Inlay hints, underlines, and signcolumns don't appear in Neovim until scrolling or editing

-- ~/.config/nvim/init.lua
-- Tested with go1.25.6 and neovim=0.12.0~ubuntu1+git202601110811-d62bbe24cb-793e58f65d-e9f8804254~ubuntu25.10.1
-- If you want to reset Neovim before installing this, run: rm -rf ~/.cache/nvim ~/.local/share/nvim

-- Load lazy.nvim. Press q to dismiss the installer.
-- Also, don't edit a Lua file on the 1st launch or there'll be a treesitter error
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not (vim.uv or vim.loop).fs_stat(lazypath) then
	local lazyrepo = "https://github.com/folke/lazy.nvim.git"
	local out = vim.fn.system({ "git", "clone", "--filter=blob:none", "--branch=stable", lazyrepo, lazypath })
	if vim.v.shell_error ~= 0 then
		vim.api.nvim_echo({
			{ "Failed to clone lazy.nvim:\n", "ErrorMsg" },
			{ out,                            "WarningMsg" },
			{ "\nPress any key to exit..." },
		}, true, {})
		vim.fn.getchar()
		os.exit(1)
	end
end
vim.opt.rtp:prepend(lazypath)
vim.g.mapleader = " "
vim.g.maplocalleader = "\\"

-- "go to declaration" isn't supported by your Lua/Go LSP.
-- "go to definition"'s similar and works
vim.keymap.set('n', 'gd', vim.lsp.buf.definition)

require("lazy").setup({
	spec = {
		-- Fix lazy.nvim-caused treesitter error
		-- Tested with tree-sitter --version: tree-sitter 0.26.3
		{ "nvim-treesitter/nvim-treesitter", lazy = false, build = ":TSUpdate" },
		{
			"saghen/blink.cmp",
			dependencies = "rafamadriz/friendly-snippets",
			version = "1.*",
			opts = {
				completion = {
					ghost_text = { enabled = true }, -- Syntax autocompletion
				}
			},
		},
		{
			"mason-org/mason-lspconfig.nvim",
			opts = {
				ensure_installed = {
					"basedpyright", -- MysticalDevil/inlay-hints suggests this not pyright
					"clangd",
					"gopls",
					"lua_ls",
					-- "stylua" -- Not required when lua_ls is installed
					"ts_ls",
				},
			},
			dependencies = {
				{ "mason-org/mason.nvim", opts = {} },
				"neovim/nvim-lspconfig",
			},
			-- mason-lspconfig is enough for stylua; no need for mason-tool-installer
		},
		-- textDocument.inlayHint is missing and doesn't do anything
		-- I wanted to use this plugin but need the workaround below
		-- 		{
		-- 			"MysticalDevil/inlay-hints.nvim",
		-- 			event = "LspAttach",
		-- 			config = function()
		-- 				require("inlay-hints").setup()
		-- 			end,
		-- 		},
	},
	checker = { enabled = true },
})
require("nvim-treesitter").install({ "lua", "vimdoc" }):wait(300000) -- Fix errors

-- Workaround to reinvent MysticalDevil/inlay-hints.nvim for lua_ls.
-- If you want to use MysticalDevil/inlay-hints.nvim, then remove this section.
-- Without this section, if inlay hints don't appear at first, just randomly edit the file e.g. press <o> <ESC> <u>.
-- With or without this section, for Lua, there's a bug where the signcolumn only appears after editing.
vim.api.nvim_create_autocmd("LspAttach", {
	callback = function(args)
		local client = vim.lsp.get_client_by_id(args.data.client_id)
		if not client then
			return -- https://vi.stackexchange.com/a/46784/51656
		end
		function enable_inlay_hints()
			if vim.lsp.inlay_hint then
				vim.lsp.inlay_hint.enable(true, { 0 }) -- https://stackoverflow.com/a/77678959/10477326
			end
		end

		if client.name == "lua_ls" and False then -- Disabled workaround to showcase this bug to GitHub issues
			-- Workaround: Delay to ensure inlay hints work at the start of opened Lua files
			vim.defer_fn(enable_inlay_hints, 500)
		else
			enable_inlay_hints()
		end
	end,
})

-- require("lspconfig") is now vim.lsp.config
vim.lsp.config("lua_ls", {
	settings = {
		Lua = {
			completion = {
				callSnippet = "Replace",
			},
			misc = {
				parameters = { "--loglevel=trace" }
			}
		}
	}
})

-- Below is adapted from MysticalDevil/inlay-hints.nvim's README
-- I removed some default/outdated parameters
vim.lsp.config("gopls", {
	settings = {
		gopls = {
			usePlaceholders = true,
			hints = {
				rangeVariableTypes = true,
				parameterNames = true,
				constantValues = true,
				assignVariableTypes = true,
				compositeLiteralFields = true,
				compositeLiteralTypes = true,
				functionTypeParameters = true,
			},
		},
	},
})

vim.lsp.config("tsserver", {
	settings = {
		typescript = {
			inlayHints = {
				includeInlayParameterNameHints = "all",
				includeInlayFunctionParameterTypeHints = true,
				includeInlayVariableTypeHints = true,
				includeInlayPropertyDeclarationTypeHints = true,
				includeInlayFunctionLikeReturnTypeHints = true,
				includeInlayEnumMemberValueHints = true,
			},
		},
		javascript = {
			inlayHints = {
				includeInlayParameterNameHints = "all",
				includeInlayFunctionParameterTypeHints = true,
				includeInlayVariableTypeHints = true,
				includeInlayPropertyDeclarationTypeHints = true,
				includeInlayFunctionLikeReturnTypeHints = true,
				includeInlayEnumMemberValueHints = true,
			},
		},
	},
})