There is no version of libIPN 4.0.0 compatible with Minecraft version 1.20.1. This issue is causing people to not be able to run mods like Inventory Profiles Next.

curseforge or Modrinth?

https://legacy.curseforge.com/minecraft/mc-mods/libipn/files/4713499

https://legacy.curseforge.com/minecraft/mc-mods/libipn/files/4713495

https://modrinth.com/mod/libipn/version/forge-1.20-4.0.0

oh I guess the Modrinth one is not marked as 1.20.1

https://modrinth.com/mod/libipn/version/fabric-1.20-4.0.0