Loader: for a non existing import the loader throws the error only the first time

[isidorn]

await import('I_DO_NOT_EXIST')

The loader correctly throws the error the first time this code is exectued.
The second time you execute the code the loader does not throw an error 🐛

Use case for me: https://github.com/Microsoft/vscode/blob/18f4630bc51a3d87c7b31d96ca9c8ea95aa649b0/src/vs/platform/sign/node/signService.ts#L14

[isidorn]

Thanks for fixing this, created a follow up item for me #78186