41.50 Composters are not Thumpable, being surrounded by them makes zombies won't see you

[Faalagorn]

It seems that player-built Composters are not Thumpable class, meaning they are ignored by Zombies. Being surrounded by them makes zombie unable to see you at all, even if you can attack them with ranged weapons or kill them with melee when they are close enough. They react to sound (so more came from neighbour), they attack windows and doors but ignore player totally.