This was posted in the Valheim Plus discussions by AssasinLemons:

TO ANYONE HAVING TROUBLE WITH VALHEIM PLUS WITH THE NEW UPDATE:

You most likely lost your inventory and possibly some other issues have occurred since updating Valheim Plus and your dedicated server.

As a temporary fix to get everything back do the following:

If you have a dedicated server:

- Launch Steam > Right click Valheim Dedicated Server and Open Properties

- Select the Betas tab and select from the drop down "default_old - Previous stable" > After updating back to the old version everything should be back to normal on the server side after a restart.

To get character inventory back:

- Launch Steam > Right click Valheim and Open Properties

- Select the Betas tab and select from the drop down "default_old - Previous stable"

- After reverting and updating your inventory will still be missing

- Launch Valheim > Go to the character in question > Select "manage saves"

- Choose the drop down carrot of the character in question and restore from the 2nd from the top file listed.

- There may be some slight data loss depending how long ago the save was but this should get your inventory back to "hopefully" its previous state or close to it


This is just a temporary fix and reverts back to the update before today. Hope this helps anyone else having this issue!


Edit: Hmm.. looks like you already tried all that.