Memory leak when conditionally stubbing fetch

I'm having an issue during a test using @std/testing/mock@std/testing/mock where I want to stub fetch for only a specific URL (an OAuth token exchange endpoint) receiving a mocked response in this case. For all other fetches, I want the fetch to behave normally. Everything seems to be functional however the test is failing due to fetchCancelHandles not being cleared up but I really can't see how this could happen as all requests made have their bodies consumed.

I wondered if any smarter people have experienced this before or have any answers as to why this specific behaviour is arising.

Error:

Leaks detected:
  - "fetchCancelHandle" was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
  - An async call to op_http_wait was started before the test, but completed during the test. Async operations should not complete in a test if they were not started in that test.
  - An async call to op_http_wait was started in this test, but never completed.
  - An async operation to send a HTTP request was started in this test, but never completed. This is often caused by not awaiting the result of a `fetch` call.
To get more details where leaks occurred, run again with the --trace-leaks flag.

Leaks detected:
  - "fetchCancelHandle" was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
  - An async call to op_http_wait was started before the test, but completed during the test. Async operations should not complete in a test if they were not started in that test.
  - An async call to op_http_wait was started in this test, but never completed.
  - An async operation to send a HTTP request was started in this test, but never completed. This is often caused by not awaiting the result of a `fetch` call.
To get more details where leaks occurred, run again with the --trace-leaks flag.

Leaks detected:
  - "fetchCancelHandle" was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
  - An async call to op_http_wait was started before the test, but completed during the test. Async operations should not complete in a test if they were not started in that test.
  - An async call to op_http_wait was started in this test, but never completed.
  - An async operation to send a HTTP request was started in this test, but never completed. This is often caused by not awaiting the result of a `fetch` call.
To get more details where leaks occurred, run again with the --trace-leaks flag.

Leaks detected:
  - "fetchCancelHandle" was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
  - An async call to op_http_wait was started before the test, but completed during the test. Async operations should not complete in a test if they were not started in that test.
  - An async call to op_http_wait was started in this test, but never completed.
  - An async operation to send a HTTP request was started in this test, but never completed. This is often caused by not awaiting the result of a `fetch` call.
To get more details where leaks occurred, run again with the --trace-leaks flag.

Memory leak when conditionally stubbing fetch

Memory leak when conditionally stubbing fetch

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