fix: always recaclulate hash when loading a module

lua/lazy/core/module.lua

@@ -17,13 +17,12 @@ function M.load(modname, modpath)
   ---@type (string|fun())?
   local chunk = Cache.get(modname)
 
-  if chunk then
   local hash = Cache.hash(modpath)
   if hash ~= M.hashes[modname] then
     M.hashes[modname] = hash
+    Cache.del(modname)
     chunk = nil
   end
-  end
 
   if chunk then
     chunk, err = loadstring(chunk --[[@as string]], "@" .. modpath)
@@ -32,9 +31,8 @@ function M.load(modname, modpath)
       vim.notify("loadfile(" .. modname .. ")")
     end)
     chunk, err = loadfile(modpath)
-    if chunk then
+    if chunk and not err then
       Cache.set(modname, string.dump(chunk))
-      M.hashes[modname] = M.hashes[modname] or Cache.hash(modpath)
     end
   end
 
@@ -56,7 +54,7 @@ function M.setup()
 
   -- preload core modules
   local root = vim.fn.fnamemodify(debug.getinfo(1, "S").source:sub(2), ":p:h:h")
-  for _, name in ipairs({ "util", "config", "loader", "state" }) do
+  for _, name in ipairs({ "util", "config", "loader", "state", "plugin" }) do
     local modname = "lazy.core." .. name
     ---@diagnostic disable-next-line: no-unknown
     package.preload[modname] = function()