Does not render chunks between pre-1.18 chunks and post-1.18 chunks

[WilliamHaiweiGu]

Areas between 256-block-tall chunks and 384-block-tall chunk are treated as air when doing overworld rendering.
For example: a vanilla mineraft world in 1.17: (rendered using latest commit: 6ffbe0f)

The same world 2 years later in 1.19: (also rendered using latest commit: 6ffbe0f)

No chunks were removed in any manner. Chunk updating works normally in game but these chunks appear as air in Overviewer render.

[ajh123]

The main README states ..

PLEASE NOTE: Overviewer is currently unmaintained. PRs will not be merged and issues will not be addressed. The website and repository will remain online and accessible.

Instead please use the new working (“successor”) version of Overviewer supporting 1.20 worlds and textures.
https://github.com/GregoryAM-SP/The-Minecraft-Overviewer