Description of the bug
I think this is a regression introduced by 2aab311.
The timer import incorrectly uses "addons" which requires import maps support or correct package.json exports parsing (not available for every tool/bundler/combination, see mrdoob/three.js#27381)
Example when using Vite 4.x:

I think it should use three/examples/jsm instead of three/addons.