Fix Pathfinding After World Has Changed (#8068)

patches/server/Mob-Pathfinding-API.patch

@@ -27,7 +27,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +public class PaperPathfinder implements com.destroystokyo.paper.entity.Pathfinder {
 +
-+    private final net.minecraft.world.entity.Mob entity;
++    private net.minecraft.world.entity.Mob entity;
 +
 +    public PaperPathfinder(net.minecraft.world.entity.Mob entity) {
 +        this.entity = entity;
@@ -38,6 +38,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return entity.getBukkitMob();
 +    }
 +
++    public void setHandle(net.minecraft.world.entity.Mob entity) {
++        this.entity = entity;
++    }
++
 +    @Override
 +    public void stopPathfinding() {
 +        entity.getNavigation().stop();
@@ -178,3 +182,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      @Override
      public void setTarget(LivingEntity target) {
          Preconditions.checkState(!this.getHandle().generation, "Cannot set target during world generation");
+@@ -0,0 +0,0 @@ public abstract class CraftMob extends CraftLivingEntity implements Mob {
+         return (net.minecraft.world.entity.Mob) entity;
+     }
+ 
++    // Paper start
++    @Override
++    public void setHandle(net.minecraft.world.entity.Entity entity) {
++        super.setHandle(entity);
++        paperPathfinder.setHandle(getHandle());
++    }
++    // Paper end
++
+     @Override
+     public String toString() {
+         return "CraftMob";