Background Process Hangs: Subprocess Wait Prevents Asynchronous Execution

Question

**Bug Description**
When Claude Code is supposed to run a command in the background, it would do the right thing (like add a 2>&1 &, or just & if I/O are not redirected). However, it will still be waiting for the process. So, I guess it is waiting for all child process of that command, and it will timeout instead of moving to the next step. This is frustrating, because to get around this sort of bug, I have to write daemon-like commands.

**Environment Info**
- Platform: macos
- Terminal: vscode