Ignore the webcam u.u

Misconfigured template. Ruins can "flatten" terrain and also "embed" structures into it. See the MCF thread for tips and examples.

Found it! https://github.com/AtomicStryker/atomicstrykers-minecraft-mods/blob/1.12.2/Ruins/src/main/resources/examplesAndDocs/template_rules.txt

But I'm using default templates

That doesn't make them any less misconfigured, friend :)
EDIT: I am taking fixes as pull requests yes please

Sure would do but I can't find any useful information in MCF thread about the fields in a .tml file.