Chunks seem to have more chunk sections than they should have

[Lauriichan]

Expected behavior

In vanilla or spigot worlds a saved Chunk in a region files has 24 sections

Observed/Actual behavior

In paper a saved Chunk in a region file has 25 sections (sometimes)

Steps/models to reproduce

1. Setup server
2. Start server
3. Open any region file using an NBT viewer

Plugin and Datapack List

none, just the server

Paper version

Other

I'm not sure if this could be considered a bug or if that is intended behaviour, some clarification would be great.

Screenshots of paper regions only:

Screenshot of spigot (left) and paper (right) region

[Owen1212055]

@Lauriichan Can you please provide the download to the region file? Feel free to DM @Owen.zip on discord or put it here.