Deno.serve terminates due to unexpected error if --unstable-otel is specified

[kawmra]

Version: Deno 2.1.4

Reproduction

This reproduction code panics in v2.1.2 and 2.1.3.
It works in 2.1.1.

// main.ts
Deno.serve((_req) => new Response("Hello, world!"));

$ deno run -A --unstable-otel main.ts

Then request to http://localhost:8000, the following error occurs:

Terminating Deno.serve loop due to unexpected error Error: instrumentation scope not available
    at submitSpan (ext:deno_telemetry/telemetry.ts:56:3)
    at endSpan (ext:deno_telemetry/telemetry.ts:170:7)
    at ext:deno_http/00_serve.ts:449:71
    at <anonymous>
    at eventLoopTick (ext:core/01_core.js:175:7)

No env vars are specified.

This doesn't happen if OTEL_EXPORTER_OTLP_PROTOCOL env var is specified (e.g. http/json) but I don't want to enable otel export in local development.