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Currently, since we use a module cache for async modules, it doesn't automatically get updated when the module registry gets updated (HMR). This technique ensures that if Webpack replaces the module (HMR) then we'll get the new Promise when we require it again. This technique doesn't work for ESM and probably not Vite since ESM will provide a new Promise each time you call `import()` but in the Webpack/CJS approach this Promise is an entry in the module cache and not a promise for the entry. I tried to replicate the original issue in the fixture but it's tricky to replicate because 1) we can't really use async modules the same way without compiling both server and client 2) even then I'm not quite sure how to repro the HMR issue.