On neoforge 21.0.134-beta, having only the base mods installed (IPN, libIPN and kotlin for forge), when clicking on the config button in the Mods menu, the game crashes.

https://mclo.gs/b3q6heL

there is nothing in the libIPN config anyway. It exists for testing purposes only.

This might be a Neoforge issue, happens on other mods too so nvm

Or maybe not? neoforged/NeoForge#1357

It also happens in Inventory Profiles Next, which is more important

and I thought neoforge will be different and not break things in the same major version of Minecraft.

fixed in libIPN 6.0.1 and IPN 2.0.3

Neoforge and forge both will do breaking changes as needed during their beta periods. We need to do so in order to actually improve with removing tech debt, refining events, fixing problems, and more.

Neoforge just released our first stable build so if you build against the latest version of Neo, there will be no more breaking changes from here on out until 1.21.1’s release.

the minor version can be used to denote breaking changes.
Shows intent and not just some random change. Also helps outside people to know there is a breaking change without needing to follow closely what happens in the project.

I was hoping this will be one of the things that neoforge will change and not just repeate Forge mistakes.