Block Enderpearl Travel Exploit

Players are able to use alt accounts and enderpearls to travel
long distances utilizing the pearls in unloaded chunks and loading
the chunk later when convenient.

This disables that by not saving the thrower when the chunk is unloaded.

This is mainly useful for survival servers that do not allow freeform teleporting.

Note: Currently removed as enderpearls are ticked as long as their owner is online in 1.21.2.
Might be worth to re-add once an option to disable the above vanilla mechanic is added, to
fully prevent enderpearl travel exploits.

== AT ==
public net.minecraft.world.entity.projectile.Projectile ownerUUID

paper-server/patches/sources/net/minecraft/world/entity/projectile/Projectile.java.patch

@@ -58,7 +58,15 @@
              return this.cachedOwner;
          } else {
              return null;
-@@ -184,12 +210,20 @@
+@@ -108,6 +134,7 @@
+     protected void readAdditionalSaveData(CompoundTag nbt) {
+         if (nbt.hasUUID("Owner")) {
+             this.setOwnerThroughUUID(nbt.getUUID("Owner"));
++            if (this instanceof ThrownEnderpearl && this.level() != null && this.level().paperConfig().fixes.disableUnloadedChunkEnderpearlExploit && this.level().paperConfig().misc.legacyEnderPearlBehavior) { this.ownerUUID = null; } // Paper - Reset pearls when they stop being ticked; Don't store shooter name for pearls to block enderpearl travel exploit
+         }
+ 
+         this.leftOwner = nbt.getBoolean("LeftOwner");
+@@ -184,12 +211,20 @@
  
          this.shoot((double) f5, (double) f6, (double) f7, speed, divergence);
          Vec3 vec3d = shooter.getKnownMovement();
@@ -81,7 +89,7 @@
              iprojectile.shootFromRotation(shooter, shooter.getXRot(), shooter.getYRot(), roll, power, divergence);
          });
      }
-@@ -201,7 +235,12 @@
+@@ -201,7 +236,12 @@
      }
  
      public static <T extends Projectile> T spawnProjectileUsingShoot(T projectile, ServerLevel world, ItemStack projectileStack, double velocityX, double velocityY, double velocityZ, float power, float divergence) {
@@ -95,12 +103,10 @@
              projectile.shoot(velocityX, velocityY, velocityZ, power, divergence);
          });
      }
-@@ -209,13 +248,47 @@
-     public static <T extends Projectile> T spawnProjectile(T projectile, ServerLevel world, ItemStack projectileStack) {
-         return Projectile.spawnProjectile(projectile, world, projectileStack, (iprojectile) -> {
+@@ -211,11 +251,45 @@
          });
-+    }
-+
+     }
+ 
 +    // Paper start - delayed projectile spawning
 +    public record Delayed<T extends Projectile>(
 +        T projectile,
@@ -129,9 +135,9 @@
 +            this.attemptSpawn(reason);
 +            return projectile();
 +        }
-     }
++    }
 +    // Paper end - delayed projectile spawning
- 
++
      public static <T extends Projectile> T spawnProjectile(T projectile, ServerLevel world, ItemStack projectileStack, Consumer<T> beforeSpawn) {
 +    // Paper start - delayed projectile spawning
 +        return spawnProjectileDelayed(projectile, world, projectileStack, beforeSpawn).spawn();
@@ -146,7 +152,7 @@
      }
  
      public void applyOnProjectileSpawned(ServerLevel world, ItemStack projectileStack) {
-@@ -232,6 +305,17 @@
+@@ -232,6 +306,17 @@
  
      }
  
@@ -164,7 +170,7 @@
      protected ProjectileDeflection hitTargetOrDeflectSelf(HitResult hitResult) {
          if (hitResult.getType() == HitResult.Type.ENTITY) {
              EntityHitResult movingobjectpositionentity = (EntityHitResult) hitResult;
-@@ -269,7 +353,13 @@
+@@ -269,7 +354,13 @@
      public boolean deflect(ProjectileDeflection deflection, @Nullable Entity deflector, @Nullable Entity owner, boolean fromAttack) {
          deflection.deflect(this, deflector, this.random);
          if (!this.level().isClientSide) {
@@ -179,7 +185,7 @@
              this.onDeflection(deflector, fromAttack);
          }
  
-@@ -309,6 +399,11 @@
+@@ -309,6 +400,11 @@
      protected void onHitEntity(EntityHitResult entityHitResult) {}
  
      protected void onHitBlock(BlockHitResult blockHitResult) {
@@ -191,7 +197,7 @@
          BlockState iblockdata = this.level().getBlockState(blockHitResult.getBlockPos());
  
          iblockdata.onProjectileHit(this.level(), iblockdata, blockHitResult, this);
-@@ -320,6 +415,15 @@
+@@ -320,6 +416,15 @@
          } else {
              Entity entity1 = this.getOwner();
  
@@ -207,7 +213,7 @@
              return entity1 == null || this.leftOwner || !entity1.isPassengerOfSameVehicle(entity);
          }
      }
-@@ -333,14 +437,8 @@
+@@ -333,14 +438,8 @@
      }
  
      protected static float lerpRotation(float prevRot, float newRot) {