[1.21.x] [Neoforge] Crash when generating chunks with additional placement

[ffuentesm]

Crash: https://pastebin.com/nwXvQiTm
Neoforge: 21.1.77
additionalplacements-NeoForge-1.21-2.1.0.jar
yungsextras 1.21.1-NeoForge-5.1.1

From what I can see in the log, the game crashes when chunks are generated, a stone stair is created, and their state crashes the game.

FirEmerald/AdditionalPlacements#102

[ffuentesm]

It happened again. It seems to be a Swamp structure causing the crash.
CrashLog: https://pastebin.com/n9wgH0DR
additionalplacements-NeoForge-1.21-2.1.0.jar
YungsExtras-1.21.1-NeoForge-5.1.1.jar
Neoforge: 21.1.81

[VirtualGaming1]

Just got this as well not just NeoForge

Minecraft Version: 1.20.1
ModLoader: Forge 47.3.12
AP Version: 2.1.0
Extra Version: 4.0.3

Log
latest.log
The server did not make the crash log for some reason but it is in the log file

One thing I noticed is something about swamp that is in the error codes