Don't tick dead players

Causes sync chunk loads and who knows what all else.
This is safe because Spectators are skipped in unloaded chunks too in vanilla.

paper-server/patches/sources/net/minecraft/server/level/ServerPlayer.java.patch

@@ -114,7 +114,7 @@
      @Nullable
      private Vec3 startingToFallPosition;
      @Nullable
-@@ -258,6 +293,32 @@
+@@ -258,7 +293,33 @@
      private final CommandSource commandSource;
      private int containerCounter;
      public boolean wonGame;
@@ -125,7 +125,7 @@
 +    public boolean queueHealthUpdatePacket;
 +    public net.minecraft.network.protocol.game.ClientboundSetHealthPacket queuedHealthUpdatePacket;
 +    // Paper end - cancellable death event
-+
+ 
 +    // CraftBukkit start
 +    public CraftPlayer.TransferCookieConnection transferCookieConnection;
 +    public String displayName;
@@ -144,9 +144,10 @@
 +    // CraftBukkit end
 +    public boolean isRealPlayer; // Paper
 +    public com.destroystokyo.paper.event.entity.PlayerNaturallySpawnCreaturesEvent playerNaturallySpawnedEvent; // Paper - PlayerNaturallySpawnCreaturesEvent
- 
++
      public ServerPlayer(MinecraftServer server, ServerLevel world, GameProfile profile, ClientInformation clientOptions) {
          super(world, world.getSharedSpawnPos(), world.getSharedSpawnAngle(), profile);
+         this.chatVisibility = ChatVisiblity.FULL;
 @@ -266,7 +327,7 @@
          this.canChatColor = true;
          this.lastActionTime = Util.getMillis();
@@ -180,8 +181,8 @@
 +        this.adventure$displayName = net.kyori.adventure.text.Component.text(this.getScoreboardName()); // Paper
 +        this.bukkitPickUpLoot = true;
 +        this.maxHealthCache = this.getMaxHealth();
-     }
++    }
- 
++
 +    // Use method to resend items in hands in case of client desync, because the item use got cancelled.
 +    // For example, when cancelling the leash event
 +    public void resendItemInHands() {
@@ -227,9 +228,9 @@
 +        }
 +
 +        return blockposition;
-+    }
+     }
 +    // CraftBukkit end
-+
+ 
      @Override
      public BlockPos adjustSpawnLocation(ServerLevel world, BlockPos basePos) {
          AABB axisalignedbb = this.getDimensions(Pose.STANDING).makeBoundingBox(Vec3.ZERO);
@@ -448,6 +449,15 @@
              this.containerMenu = this.inventoryMenu;
          }
  
+@@ -807,7 +990,7 @@
+ 
+     public void doTick() {
+         try {
+-            if (!this.isSpectator() || !this.touchingUnloadedChunk()) {
++            if (valid && !this.isSpectator() || !this.touchingUnloadedChunk()) { // Paper - don't tick dead players that are not in the world currently (pending respawn)
+                 super.tick();
+             }
+ 
 @@ -820,7 +1003,7 @@
              }
  
@@ -1519,7 +1529,7 @@
          if (entity instanceof LivingEntity entityliving) {
              Iterator iterator = entityliving.getActiveEffects().iterator();
  
-@@ -2375,10 +2966,12 @@
+@@ -2375,16 +2966,161 @@
          return TicketType.ENDER_PEARL.timeout();
      }
  
@@ -1535,10 +1545,11 @@
          }
  
          private static float calculateLookAtYaw(Vec3 respawnPos, BlockPos currentPos) {
-@@ -2387,4 +2980,147 @@
+             Vec3 vec3d1 = Vec3.atBottomCenterOf(currentPos).subtract(respawnPos).normalize();
+ 
              return (float) Mth.wrapDegrees(Mth.atan2(vec3d1.z, vec3d1.x) * 57.2957763671875D - 90.0D);
-         }
++        }
-     }
++    }
 +
 +    // CraftBukkit start - Add per-player time and weather.
 +    public long timeOffset = 0;
@@ -1563,7 +1574,7 @@
 +    public void setPlayerWeather(WeatherType type, boolean plugin) {
 +        if (!plugin && this.weather != null) {
 +            return;
-+        }
+         }
 +
 +        if (plugin) {
 +            this.weather = type;
@@ -1574,7 +1585,7 @@
 +        } else {
 +            this.connection.send(new ClientboundGameEventPacket(ClientboundGameEventPacket.START_RAINING, 0));
 +        }
-+    }
+     }
 +
 +    private float pluginRainPosition;
 +    private float pluginRainPositionPrevious;