Steps to reproduce:

1. Install Zabbix agent 2 on Windows host (cli or gui method)

2. Add-Content -Path "C:\\Program Files\\Zabbix Agent 2\\zabbix_agent2.conf" -Value "UserParameter=bar.foo,powershell -Command { Write-Host 'bar foo' }"

1. & 'C:\Program Files\Zabbix Agent 2\zabbix_agent2.exe' -T

1. Restart-Service -Name "Zabbix Agent 2" 

1. Invoke-WebRequest https://cdn.zabbix.com/zabbix/binaries/stable/7.0/7.0.22/zabbix_agent2-7.0.22-windows-amd64-openssl.msi -O zabbix_agent2-7.0.22.msi

1. msiexec.exe /l*v "zabbix_agent2_install.log" /i "zabbix_agent2-7.0.22.msi" /qn+ 

1. Check if previously addded parameter exists in conf file

Result:
UserParameter(s) (checked many and multiple location in files) has been erased from config file.
This issue does not exists when updating process is via gui.

Expected:
I know that I can move UserParameter(s) to included files (and this is indeed in most cases better practice than keeping it in main conf file), but for some reasons I must leave it there.{}