Test-run does not start -- hangs after build

[MahdiBM]

Describe the bug
Test run does not start and hangs after build. I can see the Build complete! (0.15s), but not the ◇ Test run started..
Waiting does not seem to help at all.
Restarting the test will make it run instantly like it should, assuming it doesn't bump into the same hang again.
This doesn't happen in CLI.

To Reproduce
Steps to reproduce the behavior:

• Clone https://github.com/MahdiBM/swift-dns.
• Run the tests using the VSCode test buttons and try a bunch of times.
  • Specifically i was using the normal run-test buttons, not e.g. "Debug test".
  • I don't think running a test vs suite vs all-tests makes a difference.

This is an intermittent behavior so it might take a bit to reproduce.

Expected behavior
Don't hang like in CLI.

Environment
macOS 26 is required if running on macOS. Swift 6.2 nightly (use Xcode toolchains).
Otherwise run in the devcontainer included with the project (although the swift docker image is pinned and hasn't been updated recently, maybe you'd want to remove the SHA256 pinning of the docker image if you want to use devcontainers.)

Additional context

[award999]

I wonder if we're not getting the task end event from VSCode. Over the last 5 years working on VSCode extensions I've seen it often enough where vscode is slow to let the extension know a task is done