Dev registry breaks JS->Py Worker RPC communication

[dom96]

What versions & operating system are you using?

Wrangler 4.51.0, macOS

Please provide a link to a minimal reproduction

https://github.com/cloudflare/python-workers-examples/tree/main/13-js-api-pygments

Describe the Bug

When running the TS and Py workers separately in separate terminals:

Terminal 1:

$ cd python-workers-examples/13-js-api-pygments/ts
$ npx wrangler dev

Terminal2:

$ cd python-workers-examples/13-js-api-pygments/py
$ npx wrangler dev

Then we get the following error:

[wrangler:error] Error: Network connection lost.
    at async Object.fetch (file:///Users/dominik/repos/python-workers-examples/13-js-api-pygments/ts/src/index.ts:36:18)
    at async jsonError (file:///Users/dominik/.npm/_npx/d77349f55c2be1c0/node_modules/wrangler/templates/middleware/middleware-miniflare3-json-error.ts:22:10)
    at async drainBody (file:///Users/dominik/.npm/_npx/d77349f55c2be1c0/node_modules/wrangler/templates/middleware/middleware-ensure-req-body-drained.ts:5:10)
[wrangler:info] GET / 500 Internal Server Error (32ms)

But when running via npx wrangler@latest dev -c ts/wrangler.jsonc -c py/wrangler.jsonc it works fine

Please provide any relevant error logs

No response