Patch notes
Hotfix 0.209.10 — world creation after the cloud-save overhaul
A one-line hotfix for a world-creation issue caused by the Steam Cloud save overhaul.
Valheim 0.209.10 Patch Released 21 Jun 2022 0 changes
Transcribed from the official release notes: valheim.com ↗
“Yet another hotfix, fixes issue with world creation caused by the steam cloud-save overhaul.”
From the developer's post
Will your old world still work?
Worlds created before 1.0 keep working and keep receiving new content, but 1.0 changed how terrain is generated. See save compatibility by version before you update a world you care about.