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
@@ -58,7 +58,7 @@
         } 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
             Optional<net.minecraft.commands.functions.CommandFunction<CommandListenerWrapper>> optional = ((Either) pair.getSecond()).left();
             String s;