PaperMC/paper-server/nms-patches/net/minecraft/server/commands/CommandSchedule.patch

--- a/net/minecraft/server/commands/CommandSchedule.java
+++ b/net/minecraft/server/commands/CommandSchedule.java
@@ -55,7 +55,7 @@
         } else {
             long j = commandlistenerwrapper.getLevel().getGameTime() + (long) i;
             MinecraftKey minecraftkey = (MinecraftKey) pair.getFirst();
-            CustomFunctionCallbackTimerQueue<MinecraftServer> customfunctioncallbacktimerqueue = commandlistenerwrapper.getServer().getWorldData().overworldData().getScheduledEvents();
+            CustomFunctionCallbackTimerQueue<MinecraftServer> customfunctioncallbacktimerqueue = commandlistenerwrapper.getLevel().serverLevelData.overworldData().getScheduledEvents(); // CraftBukkit - SPIGOT-6667: Use world specific function timer
 
             ((Either) pair.getSecond()).ifLeft((net_minecraft_commands_functions_commandfunction) -> {
                 String s = minecraftkey.toString();