Blocky artefacts in heightmap view with Tectonic

[lonevox]

What happened?

Below is a quarter resolution (artefacts appear at any resolution) heightmap view with Tectonic installed in 1.20.1:

It seems that regions with less terrain height variation show the artefact more.

Minecraft Version

1.20.1

Modloader (Fabric/Forge)

Forge

World-Preview Version

1.3.1

Minecraft Logs

latest.log

Additional Information

No response