Node native test runner: cannot mock a function

Steps to reproduce:

• Install volta (or set the node version in the way you wish)
• Run npm install && npm run test
• You will see:
  • The default export test passing
  • The single import test failing
  • The start import test failing

If related to the transpiling, I'm getting the same result with ts-node, so it does not seem to be related to @swc's transpilation.