Steps to reproduce:

1. On linux.
2. Run Zabbix agent on VM supporting hot plugging cpu (example, https://docs.oracle.com/en/virtualization/virtualbox/6.0/admin/cpuhotplug.html)
3. Remove cpu in middle (example if 0-4 cpu set, unplug cpu 1,2 or 3)
4. Run Zabbix agent
5. Execute Zabbix get with key system.cpu.discovery
6. Execute Zabbix get with key system.cpu.num[max]

Result:
The removed cpu will be there, for  system.cpu.discovery
The removed cpu will not be there, for system.cpu.num[max]
Expected:
The removed cpu will be there, for  system.cpu.discovery
The removed cpu will be there, for system.cpu.num[max]

Since Zabbix agent 2 uses the same parameter that Zabbix agent, the issue persists there as well.