Menu component logs findDOMNode warning in Strict Mode

[ranile]

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

Uses findDOMNode(?) which causes the warning to be logged

Expected Behavior 🤔

No warning to be logged

Steps to Reproduce 🕹

1. Run this example in strict mode
2. Open the menu
3. Notice the warning logged to the console

The logged warning

Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode. Instead, add a ref directly to the element you want to reference. Learn more about using refs safely here: https://reactjs.org/link/strict-mode-find-node
div
Paper@https://o5epz.csb.app/node_modules/@material-ui/core/esm/Paper/Paper.js:42:17
WithStyles@https://o5epz.csb.app/node_modules/@material-ui/styles/esm/withStyles/withStyles.js:47:25
Transition@https://o5epz.csb.app/node_modules/react-transition-group/esm/Transition.js:35:30
Grow@https://o5epz.csb.app/node_modules/@material-ui/core/esm/Grow/Grow.js:35:18
Unstable_TrapFocus@https://o5epz.csb.app/node_modules/@material-ui/core/esm/Unstable_TrapFocus/Unstable_TrapFocus.js:17:18
div
Portal@https://o5epz.csb.app/node_modules/@material-ui/core/esm/Portal/Portal.js:24:18
Modal@https://o5epz.csb.app/node_modules/@material-ui/core/esm/Modal/Modal.js:63:41
Popover@https://o5epz.csb.app/node_modules/@material-

Context 🔦

See the codesandbox: https://codesandbox.io/s/material-demo-forked-3zn5o
Potentially related issue: #13394

Your Environment 🌎

`npx @material-ui/envinfo`

  System:
    OS: Linux 5.12 Arch Linux
  Binaries:
    Node: 16.4.2 - /usr/bin/node
    Yarn: Not Found
    npm: 7.17.0 - /usr/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: 89.0.2 (browser used for testing)

Also see the codesandbox above

[oliviertassinari]

Duplicate of #13394

[oliviertassinari]

It's fixed in v5: https://next.material-ui.com/components/menus/#basic-menu