Fix crash caused by removing rapier rigidbody before chunk unload finished

[WaterOtter86]

Sable was removing the Rapier rigid body before Minecraft finished unloading the sublevel chunk. If a block entity touched/updated or did anythin with blocks during its chunk unload callback, Sable’s blockchange hook tried to update mass/physics and somewhy teleport? data for a body that no longer existed in Rapier, crashing the server thread. Sorry for lib.rs touch, was testing stuff.

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