Deno Panic when using --unstable-otel + hono/client RPC

[mirairoad]

Version: Deno 2.2.11
While migrating from traditional logs to OpenTelemetry, I encountered a panic when using --unstable-otel alongside hono/client for RPC.

🧪 Reproduction steps:
Using this code snippet:

import { hc } from 'hono/client';

export const client = hc<AppType>('http://localhost:1338/');

The app panics when making any request using client.*() if OpenTelemetry is enabled:

deno run --unstable-otel ...

This panic occurs regardless of:
Whether the request comes from an SPA, SSG, or a static pre-compiled client.

Runtime environment (local or deployed).

✅ Temporary fix:
Removing --unstable-otel resolves the issue and the app runs normally.

Let me know if logs or a minimal reproduction repo would help—happy to provide!