[Question] Is NeoForge 1.21.1 supported?

[daniilmight]

When trying to use the datapack on NeoForge 1.21.1, the following errors occur:

Error generating chunk ...: Cannot find multibuilding: null

I introduced file modification, and also replaced mods.toml with neoforge.mods.toml and replaced its text with:

modLoader="javafml"
loaderVersion="[4,)"
license="None"

[[mods]]
modId="testassets"
version="1.0"
displayName="Test Assets"
description='''
Test Assets for Lost Cities
'''

[[dependencies.testassets]]
modId="lostcities"
type="required"
versionRange="[1.21,)"
ordering="AFTER"
side="BOTH"

[[dependencies.testassets]]
modId="neoforge"
type="required"
versionRange="[21.0,)"
ordering="NONE"
side="BOTH"

[[dependencies.testassets]]
modId="minecraft"
type="required"
versionRange="[1.21.1]"
ordering="NONE"
side="BOTH"

and the jar file started. The testworld setting has also been added. but when entering the world, errors came out and the cities did not appear. what modifications should be done to make it work on neoforge? Is support implied?