<zone smin="0" smax="0" dmin="1" dmax="2" r="20" />
Events from cfg.eventgroups.xml file seem to spawn no infected to very small amount of infected when an event has spawned on the map. (Both Livonia and Chernarus)
Some events spawn up to 100 zombies if it's a custom event, that more than 10 objects.
I have a rather suggestion to make the zone line to spawn a fixed total amount of infected instead of an infected to object ratio. As an example, up to 20 infected for a spawn event <zone smin="0" smax="0" dmin="10" dmax="20" r="20" />, unlike the current 1 to 2 infected per object that has spawned.
Events like the vanilla police situations and military convoys spawn little to no infects at all.
Train Wrecks seem to be working fine.
Custom Events with more than 10 objects tend to spawn 40+ zombies.
I have been testing on my server and it seems to be reproducible. <zone smin="0" smax="0" dmin="1" dmax="2" r="20" /> seems to have little to no infected. <zone smin="0" smax="0" dmin="2" dmax="4" r="20" /> seems to have a moderate amount of infected.