This is expected behaviour.
The libpam-script _already_ adds the pam_script.so module to the system
on installation.
For example, from the common-auth file:
common-auth:auth sufficient pam_script.so
Since you are exiting with 0, this is sufficient to grant access.
** Changed in: libpam-script (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1325240
Title:
Lockscreen bypass with empty or wrong password
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