Issue #27608: Sigil Stone static at the Atronach Forge havoks when hit
The placed reference to the Sigil Stone static at the Atronach Forge is configured so that it havoks when hit. If the player or seemingly any NPC hits the Sigil Stone, it will be knocked off its pedestal. Once knocked off, it can't be put back.
To fix this, the havokOnHit property of the reference's defaultDisableHavokOnLoad script needs to be explicitly set to false. See the attached screenshot. This fix will definitely work for new games, but I'm not sure what to do about existing saves where the Sigil Stone static has already had havok enabled.