I encountered an unusual issue with tar on my Android device running Magisk su. When attempting to compress a directory using the 'tar -czvf archive.tar.gz directory' command, the child process spawned to perform the compression was terminated prematurely as soon as the archiver process concluded.

Reproducing this issue:

On my Android emulator with Magisk su (version 28.1), running the following command resulted in the child 'sleep' process not being found:

```
root -c "sleep 123 &"

ps -A | grep sleep
# no sleep process found
```

This behavior deviates from the expected behavior observed on both rooted Debian systems and unmodified Linux distributions, where the 'sleep' process would continue to run in the background. Here's a comparison:

**Debian (Rooted):**
```
/system/bin/sh -c "sleep 123 &"
ps -A | grep sleep
root 30923 1 11560 3620 __se_sys_nanosleep_time32 0 S sleep
```

**Magisk su (Android):**
```
root -c "sleep 123 &"
ps -aux | grep sleep
root 207105 0.0 0.0 3212 1020 ? S 15:41 0:00 sleep 123
```

**Key Questions:**
Is this unexpected child process termination a feature or a bug within Magisk su?
Is there a configuration option or workaround to prevent this behavior? Understanding the cause and potential solutions would be greatly appreciated.

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