DH generates vanilla chunks LODs in a Premade world

I've got an Earth map world. But when I expect LODs to generate,
outside of vanilla render distance, I get vanilla-like chunks, not the ones of the 'Earth' which are premade!

Attached are 2 shots of how it goes
Firstly, the vanilla render distance, but then DH kicks in with them Icy Peaks outside.
There shouldn't really be, instead there would be premade Earth map chunks
2024-04-07_06.21.52.png
2024-04-07_06.25.48.png
Solution
Okay, so after a while, came back to tell the solution.

The Solution is:
When experiencing troubles with a world taken from an older version, or made with WorldPainter,
make sure to 'Optimize' the world, it's done by:

going to Singleplayer >> find the save >> Edit >> Optimize World
image.png
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