Steps to reproduce:

1. I did an update from 5.2.6 to 5.4.2 (zabbix_server and zabbix_agent2)
2. Allow in zabbix_agent2.conf this key : AllowKey=system.run["find *"]
3. Restart zabbix_agent2 : systemctl restart zabbix-agent2.service
4. An item created in previous version (5.2.6 and zabbix_agent v1) with key like : system.run[find /tmp/*] is not working anymore : Not supported: "Remote commands are not supported"
5. Item works fine when you use zabbix_agent2 -test command
6. Item works fine when you use the Test button on interface
7. Clone the item, change the key to system.run["find /tmp/*"]
8. Item is now working
9. Delete the old item
10. Go back to old item configuration into the new item system.run[find /tmp/*]
11. Item is working

Expected:
Items with key=system.run from Zabbix 5.2.6 should work fine.