KeepUnknownPieces
Stops Valheim from deleting built pieces whose mod failed to load. If a mod breaks for a session, its pieces (and what's stored in them) are kept instead of wiped.Keep Unknown Pieces
When a mod fails to load for a session, Valheim deletes every built piece that mod added - along with whatever was stored in it. This plugin stops that: pieces from a missing mod are kept in the world (and logged), so they come back when the mod loads again.
Install
Use a mod manager (Gale / r2modman) or drop KeepUnknownPieces.dll into BepInEx/plugins.