`block run` returns `404` for all but `bundle.js` in Hello World example

[bodegabodega]

block run starts the servers with no warnings or errors but returns a 404 for all endpoints except for /bundle.js. I'm using the most basic Hello World example. I've downrevved node and the block-cli to no avail.

❯ node -v
v22.19.0
❯ block -v
@airtable/blocks-cli/3.0.0 darwin-arm64 node-v22.19.0

❯ curl -I -k https://localhost:9000/bundle.js
HTTP/1.1 200 OK
X-Powered-By: Express
Access-Control-Allow-Origin: *
content-type: application/javascript
date: Wed, 01 Oct 2025 11:02:39 GMT
connection: close

❯ curl -I -k https://localhost:9000
HTTP/1.1 404 Not Found
X-Powered-By: Express
Access-Control-Allow-Origin: *
content-type: text/plain
date: Wed, 01 Oct 2025 11:02:55 GMT
connection: close