The Spear Group of Equipment Items still has the pre-errata stats relating to Damage and the “Cumbersome” feature, even though the Core Rules in the Demiplane Library has the new updated stats in their Weapons tables.
Spear Item: Demiplane
Weapons Tables, see Spear entry: Demiplane
Thanks for the report. The text of a book is actually the easier one to update so it looks like that was updated and the stats of the item itself are just waiting on a patch.
Edit: This was actually patched about an hour ago so it should be appear correct now.
The issue does seem to be fixed, thank you to you and the Demiplane staff for your help 