pam_auth_v2 still doesn't work in 10.4.8

tee /tmp/pam_log_script.sh <<EOF

#!/bin/bash

PASS=$(cat -)

echo $PASS

echo "\${PAM_SERVICE}:\${PAM_TYPE} - \${PAM_RUSER}@\${PAM_RHOST} is authenticating as \${PAM_USER}" 

EOF

chmod 0775 /tmp/pam_log_script.sh

auth optional pam_exec.so debug expose_authtok log=/tmp/pam_output.txt /tmp/pam_log_script.sh

INSTALL SONAME 'auth_pam_v1'

<authenticate from PHP with mysqli_connect("mariadb-alpine", "test_account", "uGBXHxID3dJRALw2", "test_account")>

# cat /tmp/pam_output.txt

*** Thu Sep 12 13:16:11 2019

/tmp/pam_log_script.sh: line 2: warning: command substitution: ignored null byte in input

uGBXHxID3dJRALw2

mysql:auth - @ is authenticating as test_account

UNINSTALL SONAME 'auth_pam_v1'

INSTALL SONAME 'auth_pam'

<authenticate from PHP with mysqli_connect("mariadb-alpine", "test_account", "uGBXHxID3dJRALw2", "test_account")>

# cat /tmp/pam_output.txt

*** Thu Sep 12 13:16:35 2019

/tmp/pam_log_script.sh: line 2: warning: command substitution: ignored null byte in input

uGBXHxID3dJRALw  <<<< LAST CHARACTER MISSING

mysql:auth - @ is authenticating as test_account