symlink files are redirected to zero bytes when ls -l | su

Issue

• I want to know why the file size is changed to "0" through the command. and only certain files change to "0"?

• Is there any way to avoid this problem?

$ cd /usr/bin
$ ls -al | bash
bash: line 1: total: command not found
bash: line 2: dr-xr-xr-x.: command not found
bash: line 3: drwxr-xr-x.: command not found
bash: line 4: -rwxr-xr-x: command not found
...


$ find /usr/bin/ -size 0 -exec ls -al {} \;|awk '{print $9}'

# Before executing the command (no target file). )

# After executing the command (there is a file whose size has been changed to "0". )

...
-rwxr-xr-x   1 root root         0 Dec 29 15:16 bashbug-64
-rw-r--r--   1 root root         0 Dec 29 15:16 bzdiff
-rw-r--r--   1 root root         0 Dec 29 15:16 bzip2
-rw-r--r--   1 root root         0 Dec 29 15:16 bzmore
-rwxr-xr-x   1 root root         0 Dec 29 15:16 consolehelper
...