Slime Biome with zero Slimelung

I can't confirm, but it may be a matter of heat killing all the germs already. You're at cycle 200+. If the slime biomes are high in temperature, it could have klled the slimelung.

I think slimelung should be dying if the temperature is above 90 degrees Celsius.

Actually I have a savegame where this same thing is happening also - it just never had it to begin with. only pufts and morbs were generating it - no slimelung in slime. New games are all 'normal'.