Fixed the bug where the backpack disappeared after death.

● Fixed the bug where, after character death, if the respawn point was very far away, the dropped backpack would fail to load correctly.

● Fixed the bug where players returning to base from another biome would find that underground caves they had dug were covered by terrain.

● Added an option to make glue based on player requests. Press F1 to enter the crafting interface. Use Wood + Plant Fiber to make Sap, then use Water + Bones + Sap in a Campfire to cook it into Glue.