Fix Projectile#setOwner(null) not clearing owner (#9715)

* Fix Projectile#setOwner(null) not clearing owner

* rebased and merged into mentioned patch

---------

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>

patches/server/0960-Refresh-ProjectileSource-for-projectiles.patch

@@ -8,6 +8,11 @@ the API matches the owner UUID specified in the entity nbt.
 Previously, after the entity reloaded, Projectile#getShooter
 would return null, while the entity still had an owner.
 
+Also fixes setting the shooter/owner to null actually
+clearing the owner.
+
+Co-authored-by: Warrior <50800980+Warriorrrr@users.noreply.github.com>
+
 diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
 index d9f6b0e0b20f4106ffead6b773b5489b71924c61..cf9393dd02565134a1ce428e84a9f26ac2d39a0d 100644
 --- a/src/main/java/net/minecraft/world/entity/Entity.java
@@ -21,15 +26,22 @@ index d9f6b0e0b20f4106ffead6b773b5489b71924c61..cf9393dd02565134a1ce428e84a9f26a
      public boolean lastDamageCancelled; // SPIGOT-5339, SPIGOT-6252, SPIGOT-6777: Keep track if the event was canceled
      public boolean persistentInvisibility = false;
 diff --git a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
-index 6d7ac0c8c171834fa8da94f158258a4774d80ec4..1b7cf6d06bdf36f146656727511a461f2520762e 100644
+index 6d7ac0c8c171834fa8da94f158258a4774d80ec4..a90317100d32974e481e14476843f66997a2cf3a 100644
 --- a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
 +++ b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
-@@ -49,14 +49,24 @@ public abstract class Projectile extends Entity implements TraceableEntity {
+@@ -49,14 +49,31 @@ public abstract class Projectile extends Entity implements TraceableEntity {
              this.ownerUUID = entity.getUUID();
              this.cachedOwner = entity;
          }
 -        this.projectileSource = (entity != null && entity.getBukkitEntity() instanceof ProjectileSource) ? (ProjectileSource) entity.getBukkitEntity() : null; // CraftBukkit
 -
++        // Paper start - Fix null owners not being handled
++        else {
++            this.ownerUUID = null;
++            this.cachedOwner = null;
++            this.projectileSource = null;
++        }
++        // Paper end
 +        this.refreshProjectileSource(false); // Paper
 +    }
 +    // Paper start
@@ -51,7 +63,7 @@ index 6d7ac0c8c171834fa8da94f158258a4774d80ec4..1b7cf6d06bdf36f146656727511a461f
              return this.cachedOwner;
          } else if (this.ownerUUID != null && this.level() instanceof ServerLevel) {
              this.cachedOwner = ((ServerLevel) this.level()).getEntity(this.ownerUUID);
-@@ -72,6 +82,7 @@ public abstract class Projectile extends Entity implements TraceableEntity {
+@@ -72,6 +89,7 @@ public abstract class Projectile extends Entity implements TraceableEntity {
                  }
              }
              // Paper end