Looks like a bug was introduced with the Menu component in the recent 6.0.8 patch release. After upgrade users complained that menus are opening up when clicking anywhere on the screen, instead of when the Target is clicked. Reverted to 6.0.7 and the issue does not occur.
Sandbox
https://codesandbox.io/s/nifty-curran-fy1nlu?file=/src/App.tsx