Program: 27551
Project: 27551
Buggy source:
public static void preEventPhaseCheck(IEventListener listener,Event event){
  if (!CauseTracker.ENABLED) {
    return;
  }
  if (event instanceof TickEvent.WorldTickEvent) {
    final TickEvent.WorldTickEvent worldTickEvent=(TickEvent.WorldTickEvent)event;
    if (!(worldTickEvent.world instanceof IMixinWorldServer)) {
      return;
    }
    if (worldTickEvent.phase == TickEvent.Phase.START) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.PRE_WORLD_TICK_LISTENER,PhaseContext.start().add(NamedCause.source(listener)).add(NamedCause.of(InternalNamedCauses.Tracker.TICK_EVENT,event)).addCaptures().player().complete());
    }
 else     if (worldTickEvent.phase == TickEvent.Phase.END) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.POST_WORLD_TICK_LISTENER,PhaseContext.start().add(NamedCause.source(listener)).add(NamedCause.of(InternalNamedCauses.Tracker.TICK_EVENT,event)).addCaptures().player().complete());
    }
  }
  if (event instanceof TickEvent.ServerTickEvent) {
    final TickEvent.ServerTickEvent serverTickEvent=(TickEvent.ServerTickEvent)event;
    if (serverTickEvent.phase == TickEvent.Phase.START) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.PRE_SERVER_TICK_LISTENER,PhaseContext.start().add(NamedCause.source(listener)).add(NamedCause.of(InternalNamedCauses.Tracker.TICK_EVENT,event)).addCaptures().player().complete());
    }
 else     if (serverTickEvent.phase == TickEvent.Phase.END) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.POST_SERVER_TICK_LISTENER,PhaseContext.start().source(listener).addExtra(InternalNamedCauses.Tracker.TICK_EVENT,event).addCaptures().player().complete());
    }
  }
}

Fixed version (ground truth):
public static void preEventPhaseCheck(IEventListener listener,Event event){
  if (!CauseTracker.ENABLED) {
    return;
  }
  if (event instanceof TickEvent.WorldTickEvent) {
    final TickEvent.WorldTickEvent worldTickEvent=(TickEvent.WorldTickEvent)event;
    if (!(worldTickEvent.world instanceof IMixinWorldServer)) {
      return;
    }
    if (worldTickEvent.phase == TickEvent.Phase.START) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.PRE_WORLD_TICK_LISTENER,PhaseContext.start().source(listener).addExtra(InternalNamedCauses.Tracker.TICK_EVENT,event).addCaptures().player().complete());
    }
 else     if (worldTickEvent.phase == TickEvent.Phase.END) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.POST_WORLD_TICK_LISTENER,PhaseContext.start().source(listener).addExtra(InternalNamedCauses.Tracker.TICK_EVENT,event).addCaptures().player().complete());
    }
  }
  if (event instanceof TickEvent.ServerTickEvent) {
    final TickEvent.ServerTickEvent serverTickEvent=(TickEvent.ServerTickEvent)event;
    if (serverTickEvent.phase == TickEvent.Phase.START) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.PRE_SERVER_TICK_LISTENER,PhaseContext.start().source(listener).addExtra(InternalNamedCauses.Tracker.TICK_EVENT,event).addCaptures().player().complete());
    }
 else     if (serverTickEvent.phase == TickEvent.Phase.END) {
      CauseTracker.getInstance().switchToPhase(PluginPhase.Listener.POST_SERVER_TICK_LISTENER,PhaseContext.start().source(listener).addExtra(InternalNamedCauses.Tracker.TICK_EVENT,event).addCaptures().player().complete());
    }
  }
}