Fix a bunch more issues arising from mutable types (#11769)

paper-api/src/main/java/com/destroystokyo/paper/event/block/BlockDestroyEvent.java

@@ -55,7 +55,7 @@ public class BlockDestroyEvent extends BlockExpEvent implements Cancellable {
      * @param effectBlock block effect
      */
     public void setEffectBlock(final BlockData effectBlock) {
-        this.effectBlock = effectBlock;
+        this.effectBlock = effectBlock.clone();
     }
 
     /**

paper-api/src/main/java/com/destroystokyo/paper/event/player/PlayerJumpEvent.java

@@ -79,7 +79,7 @@ public class PlayerJumpEvent extends PlayerEvent implements Cancellable {
     public void setFrom(final Location from) {
         Preconditions.checkArgument(from != null, "Cannot use null from location!");
         Preconditions.checkArgument(from.getWorld() != null, "Cannot use from location with null world!");
-        this.from = from;
+        this.from = from.clone();
     }
 
     /**

paper-api/src/main/java/com/destroystokyo/paper/event/player/PlayerSetSpawnEvent.java

@@ -66,7 +66,7 @@ public class PlayerSetSpawnEvent extends PlayerEvent implements Cancellable {
      * @param location the spawn location, or {@code null} to remove the spawn location
      */
     public void setLocation(final @Nullable Location location) {
-        this.location = location;
+        this.location = location != null ? location.clone() : null;
     }
 
     /**

paper-api/src/main/java/io/papermc/paper/event/entity/EntityMoveEvent.java

@@ -53,7 +53,7 @@ public class EntityMoveEvent extends EntityEvent implements Cancellable {
      */
     public void setFrom(final Location from) {
         this.validateLocation(from);
-        this.from = from;
+        this.from = from.clone();
     }
 
     /**
@@ -72,7 +72,7 @@ public class EntityMoveEvent extends EntityEvent implements Cancellable {
      */
     public void setTo(final Location to) {
         this.validateLocation(to);
-        this.to = to;
+        this.to = to.clone();
     }
 
     /**

paper-api/src/main/java/io/papermc/paper/event/world/border/WorldBorderCenterChangeEvent.java

@@ -52,7 +52,7 @@ public class WorldBorderCenterChangeEvent extends WorldBorderEvent implements Ca
      * @param newCenter the new center
      */
     public void setNewCenter(final Location newCenter) {
-        this.newCenter = newCenter;
+        this.newCenter = newCenter.clone();
     }
 
     @Override

paper-api/src/main/java/io/papermc/paper/potion/PotionMix.java

@@ -30,9 +30,9 @@ public final class PotionMix implements Keyed {
      */
     public PotionMix(final NamespacedKey key, final ItemStack result, final RecipeChoice input, final RecipeChoice ingredient) {
         this.key = key;
-        this.result = result;
+        this.result = result.clone();
-        this.input = input;
+        this.input = input.clone();
-        this.ingredient = ingredient;
+        this.ingredient = ingredient.clone();
     }
 
     /**
@@ -58,7 +58,7 @@ public final class PotionMix implements Keyed {
      * @return the result itemstack
      */
     public ItemStack getResult() {
-        return this.result;
+        return this.result.clone();
     }
 
     /**
@@ -67,7 +67,7 @@ public final class PotionMix implements Keyed {
      * @return the bottom 3 slot ingredients
      */
     public RecipeChoice getInput() {
-        return this.input;
+        return this.input.clone();
     }
 
     /**
@@ -76,7 +76,7 @@ public final class PotionMix implements Keyed {
      * @return the top slot input
      */
     public RecipeChoice getIngredient() {
-        return this.ingredient;
+        return this.ingredient.clone();
     }
 
     @Override

paper-api/src/main/java/org/bukkit/Vibration.java

@@ -79,7 +79,7 @@ public class Vibration {
             private final Location block;
 
             public BlockDestination(@NotNull Location block) {
-                this.block = block;
+                this.block = block.clone();
             }
 
             public BlockDestination(@NotNull Block block) {
@@ -88,7 +88,7 @@ public class Vibration {
 
             @NotNull
             public Location getLocation() {
-                return block;
+                return block.clone();
             }
 
             @NotNull

paper-api/src/main/java/org/bukkit/event/block/BlockDispenseEvent.java

@@ -65,7 +65,7 @@ public class BlockDispenseEvent extends BlockEvent implements Cancellable {
      * @param vel the velocity of the item being dispensed
      */
     public void setVelocity(@NotNull Vector vel) {
-        velocity = vel;
+        velocity = vel.clone();
     }
 
     @Override

paper-api/src/main/java/org/bukkit/event/block/FluidLevelChangeEvent.java

@@ -43,7 +43,7 @@ public class FluidLevelChangeEvent extends BlockEvent implements Cancellable {
         Preconditions.checkArgument(newData != null, "newData null");
         Preconditions.checkArgument(this.newData.getMaterial().equals(newData.getMaterial()), "Cannot change fluid type");
 
-        this.newData = newData;
+        this.newData = newData.clone();
     }
 
     @Override

paper-api/src/main/java/org/bukkit/event/entity/EntityKnockbackEvent.java

@@ -99,7 +99,7 @@ public class EntityKnockbackEvent extends EntityEvent implements Cancellable {
     public void setFinalKnockback(@NotNull Vector knockback) {
         Preconditions.checkArgument(knockback != null, "Knockback cannot be null");
 
-        this.knockback = knockback;
+        this.knockback = knockback.clone();
     }
 
     @Override

paper-api/src/main/java/org/bukkit/event/entity/EntityTeleportEvent.java

@@ -52,7 +52,7 @@ public class EntityTeleportEvent extends EntityEvent implements Cancellable {
      * @param from New location this entity moved from
      */
     public void setFrom(@NotNull Location from) {
-        this.from = from;
+        this.from = from.clone();
     }
 
     /**
@@ -71,7 +71,7 @@ public class EntityTeleportEvent extends EntityEvent implements Cancellable {
      * @param to New Location this entity moved to
      */
     public void setTo(@Nullable Location to) {
-        this.to = to;
+        this.to = to != null ? to.clone() : null;
     }
 
     @NotNull

paper-api/src/main/java/org/bukkit/event/player/PlayerInteractEvent.java

@@ -241,7 +241,7 @@ public class PlayerInteractEvent extends PlayerEvent implements Cancellable {
     @Nullable
     @Deprecated // Paper
     public Vector getClickedPosition() {
-        return clickedPosistion;
+        return clickedPosistion.clone();
     }
 
     // Paper start

paper-api/src/main/java/org/bukkit/event/player/PlayerMoveEvent.java

@@ -70,7 +70,7 @@ public class PlayerMoveEvent extends PlayerEvent implements Cancellable {
      */
     public void setFrom(@NotNull Location from) {
         validateLocation(from);
-        this.from = from;
+        this.from = from.clone();
     }
 
     /**
@@ -90,7 +90,7 @@ public class PlayerMoveEvent extends PlayerEvent implements Cancellable {
      */
     public void setTo(@NotNull Location to) {
         validateLocation(to);
-        this.to = to;
+        this.to = to.clone();
     }
 
     // Paper start - PlayerMoveEvent improvements

paper-api/src/main/java/org/bukkit/event/player/PlayerRespawnEvent.java

@@ -69,7 +69,7 @@ public class PlayerRespawnEvent extends PlayerEvent {
         Preconditions.checkArgument(respawnLocation != null, "Respawn location can not be null");
         Preconditions.checkArgument(respawnLocation.getWorld() != null, "Respawn world can not be null");
 
-        this.respawnLocation = respawnLocation;
+        this.respawnLocation = respawnLocation.clone();
     }
 
     /**

paper-api/src/main/java/org/bukkit/event/player/PlayerVelocityEvent.java

@@ -45,7 +45,7 @@ public class PlayerVelocityEvent extends PlayerEvent implements Cancellable {
      * @param velocity The velocity vector that will be sent to the player
      */
     public void setVelocity(@NotNull Vector velocity) {
-        this.velocity = velocity;
+        this.velocity = velocity.clone();
     }
 
     @NotNull

paper-api/src/main/java/org/bukkit/event/world/AsyncStructureSpawnEvent.java

@@ -45,7 +45,7 @@ public class AsyncStructureSpawnEvent extends WorldEvent implements Cancellable
      */
     @NotNull
     public BoundingBox getBoundingBox() {
-        return boundingBox;
+        return boundingBox.clone();
     }
 
     /**

paper-api/src/main/java/org/bukkit/loot/LootContext.java

@@ -24,7 +24,7 @@ public final class LootContext {
     private LootContext(@NotNull Location location, float luck, int lootingModifier, @Nullable Entity lootedEntity, @Nullable HumanEntity killer) {
         Preconditions.checkArgument(location != null, "LootContext location cannot be null");
         Preconditions.checkArgument(location.getWorld() != null, "LootContext World cannot be null");
-        this.location = location;
+        this.location = location.clone();
         this.luck = luck;
         this.lootingModifier = lootingModifier;
         this.lootedEntity = lootedEntity;
@@ -38,7 +38,7 @@ public final class LootContext {
      */
     @NotNull
     public Location getLocation() {
-        return location;
+        return location.clone();
     }
 
     /**
@@ -110,7 +110,7 @@ public final class LootContext {
          * @param location the location the LootContext should use
          */
         public Builder(@NotNull Location location) {
-            this.location = location;
+            this.location = location.clone();
         }
 
         /**

paper-api/src/main/java/org/bukkit/util/Transformation.java

@@ -27,9 +27,9 @@ public class Transformation {
         Preconditions.checkArgument(scale != null, "scale cannot be null");
         Preconditions.checkArgument(rightRotation != null, "rightRotation cannot be null");
 
-        this.translation = translation;
+        this.translation = new Vector3f(translation);
         this.leftRotation = new Quaternionf(leftRotation);
-        this.scale = scale;
+        this.scale = new Vector3f(scale);
         this.rightRotation = new Quaternionf(rightRotation);
     }
 
@@ -39,10 +39,10 @@ public class Transformation {
         Preconditions.checkArgument(scale != null, "scale cannot be null");
         Preconditions.checkArgument(rightRotation != null, "rightRotation cannot be null");
 
-        this.translation = translation;
+        this.translation = new Vector3f(translation);
-        this.leftRotation = leftRotation;
+        this.leftRotation = new Quaternionf(leftRotation);
-        this.scale = scale;
+        this.scale = new Vector3f(scale);
-        this.rightRotation = rightRotation;
+        this.rightRotation = new Quaternionf(rightRotation);
     }
 
     /**
@@ -52,7 +52,7 @@ public class Transformation {
      */
     @NotNull
     public Vector3f getTranslation() {
-        return this.translation;
+        return new Vector3f(this.translation);
     }
 
     /**
@@ -62,7 +62,7 @@ public class Transformation {
      */
     @NotNull
     public Quaternionf getLeftRotation() {
-        return this.leftRotation;
+        return new Quaternionf(this.leftRotation);
     }
 
     /**
@@ -72,7 +72,7 @@ public class Transformation {
      */
     @NotNull
     public Vector3f getScale() {
-        return this.scale;
+        return new Vector3f(this.scale);
     }
 
     /**
@@ -82,7 +82,7 @@ public class Transformation {
      */
     @NotNull
     public Quaternionf getRightRotation() {
-        return this.rightRotation;
+        return new Quaternionf(this.rightRotation);
     }
 
     @Override

paper-api/src/main/java/org/spigotmc/event/player/PlayerSpawnLocationEvent.java

@@ -37,7 +37,7 @@ public class PlayerSpawnLocationEvent extends PlayerEvent {
      * @param location the spawn location
      */
     public void setSpawnLocation(@NotNull Location location) {
-        this.spawnLocation = location;
+        this.spawnLocation = location.clone();
     }
 
     @NotNull