Hello, what is the expected behavior for the indicator option "ignore_liquids"? Should block generated above the sea or on ocean floor?

I set "ignore_liquids" to true but indicators are still generated above the sea

That is a good question, and the answer is "whoops I forgot to re-implement that in 1.15"

As to what it should do, it should change the height map that is used to find the surface - one that either does or does not ignore liquids.