MC/F 1.12.2/2611

I just found a swamp full of Swamp Things, hundreds of the bloody things, in a Wetlands biome. Set config to false but just a heads up for this bug.

Hello. Thank you for report.
Could you please provide more information about it? I've got few similar reports about drowned and divers ( #106 ), but unfortunately I don't know how to reproduce it - I waited a lot, but there weren't to much of them.
Are you playing alone or on server?
Also it will ne nice to get a screenshot, if it's possible.

Ah, apologies.

Single player, heavily modded (sorry, adds to your headache I know). Interestingly, even though I set config to false, reloading the world they were still there.

I killed them all, but I'll head out to that area again for another look & grab a screenie for you.

Interestingly, even though I set config to false, reloading the world they were still there.

This option only disable natural spawning of this mobs.

It can be spawned only in swamp biomes in water in the darkness.

What criteria do they need to spawn? Biome, depth of water, block type (i.e. mud?) and so on?

I found the biome area again and no spawning now although I did replace the mud with gravel. Now off exploring the world to see if I can find another wetlands biome & whether they show up again.

Could you please provide me a full list of mods you are using?