serveStatic invalid response when index.html is not found

[alexgleason]

What version of Hono are you using?

4.6.9

What runtime/platform is your app running on? (with version if possible)

Deno

What steps can reproduce the bug?

const publicFiles = serveStatic({ root: './public/' });
app.use('/.well-known/*', publicFiles);

Ensure that ./public/.well-known/ exists, but does not contain an index.html, then:

➜  curl http://0.0.0.0:4036/.well-known/
curl: (18) transfer closed with outstanding read data remaining
➜  curl http://0.0.0.0:4036/.well-known
curl: (18) transfer closed with outstanding read data remaining

What is the expected behavior?

It should return a valid 404 response.

What do you see instead?

It does not return a valid response.

Additional information

No response