Steps to reproduce:

1. Turn discovery on for non-running containers
2. Execute get_info on non-running container

Result:
sudo -u zabbix zabbix_agent2 -t docker.container_stats["/MYCONAINER"]

2022/05/25 15:32:37.002331 failed to execute direct exporter task for key 'docker.container_stats[/MYCONAINER]' error: 'Cannot marshal JSON: json: unsupported value: NaN.'
docker.container_stats[/MYCONAINER]       [m|ZBX_NOTSUPPORTED] [Cannot marshal JSON: json: unsupported value: NaN.] 

Running docker inspect on the non-running container still yields data.