Terrain preview graph does not respect replacer settings

[muzikbike]

For example,, turning on lava oceans and then navigating there will still display the ocean level as blue instead of changing accordingly.

The graph could check and use the respective map colours of the selected blocks.

[Barteks2x]

It's not intended to be accurate representation of block types, just terrain shape. The blue color just represents ocean level. You making it a lava ocean is detail.