Since 3.4 exit code for scripts is checked, it means that some scripts will now become unsupported, for example grep:
"Normally the exit status is 0 if a line is selected, 1 if no lines were selected, and 2 if an error occurred."
So it is expected that some commands should not become unsupported on some error codes.
UserParameter examples are also broken.
Current workaround to make default example work is to change following user parameter: