Wrong password with % character

debug (line:2771) : Loading /etc/proxysql-admin.cnf 
debug: ProxySQL datadir: /var/lib/proxysql
debug (line:712) : exec_sql : proxyadmin@localhost:6032 ==> SELECT 1 
ERROR 1045 (28000): ProxySQL Error: Access denied for user 'proxyadmin'@'127.0.0.1' (using password: YES) 
debug: --> query failed 1 ERROR (line:713) : ProxySQL connection check failed. 
-- Could not connect to ProxySQL at localhost:6032 
-- Please check the ProxySQL connection parameters and status.

mysql -uproxyadmin -p% -h127.0.0.1 -P6032

export PROXYSQL_DATADIR='/var/lib/proxysql' 
export PROXYSQL_USERNAME='proxyadmin' 
export PROXYSQL_PASSWORD='%' 
export PROXYSQL_HOSTNAME='localhost' 
export PROXYSQL_PORT='6032'
# PXC admin credentials for connecting to pxc-cluster-node. 
export CLUSTER_USERNAME='operator' 
export CLUSTER_PASSWORD='operator' 
export CLUSTER_PORT='3306'
# proxysql monitoring user. proxysql admin script will create this user in pxc to monitor pxc-nodes. 
export MONITOR_USERNAME='monitor' 
export MONITOR_PASSWORD='monitor' 
export USE_EXISTING_MONITOR_PASSWORD=1
# Application user to connect to pxc-node through proxysql 
export WITH_CLUSTER_APP_USER=0
# ProxySQL hostgroup IDs 
export READER_HOSTGROUP_ID='10' 
export WRITER_HOSTGROUP_ID='11' 
export BACKUP_WRITER_HOSTGROUP_ID='12' 
export OFFLINE_HOSTGROUP_ID='13'
# ProxySQL read/write configuration mode. export MODE="singlewrite" 
export WRITE_NODE=""
# max_connections default (used only when INSERTing a new mysql_servers entry) 
export MAX_CONNECTIONS="1000"
# Determines the maximum number of writesets a node can have queued 
# before the node is SHUNNED to avoid stale reads. 
export MAX_TRANSACTIONS_BEHIND=100

datadir="/var/lib/proxysql"
admin_variables =
{
 admin_credentials="proxyadmin:%"
 mysql_ifaces="0.0.0.0:6032"
 refresh_interval=2000
 cluster_username="proxyadmin"
 cluster_password="%"
 cluster_check_interval_ms=200
 cluster_check_status_frequency=100
 cluster_mysql_query_rules_save_to_disk=true
 cluster_mysql_servers_save_to_disk=true
 cluster_mysql_users_save_to_disk=true
 cluster_proxysql_servers_save_to_disk=true
 cluster_mysql_query_rules_diffs_before_sync=1
 cluster_mysql_servers_diffs_before_sync=1
 cluster_mysql_users_diffs_before_sync=1
 cluster_proxysql_servers_diffs_before_sync=1
}
 
mysql_variables=
{
 monitor_password="monitor"
 monitor_galera_healthcheck_interval=1000
 threads=2
 max_connections=2048
 default_query_delay=0
 default_query_timeout=10000
 poll_timeout=2000
 interfaces="0.0.0.0:3306"
 default_schema="information_schema"
 stacksize=1048576
 connect_timeout_server=10000
 monitor_history=60000
 monitor_connect_interval=20000
 monitor_ping_interval=10000
 ping_timeout_server=200
 commands_stats=true
 sessions_sort=true
 have_ssl=true
 ssl_p2s_ca="/etc/proxysql/ssl-internal/ca.crt"
 ssl_p2s_cert="/etc/proxysql/ssl-internal/tls.crt"
 ssl_p2s_key="/etc/proxysql/ssl-internal/tls.key"
 ssl_p2s_cipher="ECDHE-RSA-AES128-GCM-SHA256"
}