I has happened twice now. When adding svetlogorsk the cars and tents stopped spawning loot, now with black meadows houses like http://i.imgur.com/w1vvsU9.jpg or http://i.imgur.com/w1vvsU9.jpg stopped spawning in some rooms.

This is definitely a different issue than id=8809 (loot spawning under the floor).

I suspect that the spawning algorithm at server restart is somehow capped at a specific amount of lootspawns.