In the browse, open dev tool, inspect the screen, no cube being rendered, resize the dev tool, a cube is there
if you think it is working, for example, in Chrome, right-click the refresh button, click the Empty Cache and Hard Reload, try it for a few times, it will sometimes after a certain times.
ENV
How to re-produce
npx create-react-app my-app
cd my app
yarn add three react-three-fiber
yarn start
Empty Cache and Hard Reload
, try it for a few times, it will sometimes after a certain times.