Program: 157663
Project: 157663
Buggy source:
@Override public void watch(GameEvent event,Game game){
  if (event.getType() == GameEvent.EventType.BEGIN_COMBAT_STEP_PRE) {
    this.oozeBlocksOrBlocked.clear();
  }
  if (event.getType() == GameEvent.EventType.BLOCKER_DECLARED) {
    Permanent attacker=game.getPermanent(event.getTargetId());
    Permanent blocker=game.getPermanent(event.getSourceId());
    if (attacker != null && attacker.getName().equals("String_Node_Str")) {
      if (blocker != null && hasAttachedEquipment(game,blocker)) {
        MageObjectReference oozeMor=new MageObjectReference(attacker,game);
        HashSet<MageObjectReference> relatedCreatures=oozeBlocksOrBlocked.getOrDefault(oozeMor,new HashSet<>());
        relatedCreatures.add(new MageObjectReference(event.getSourceId(),game));
        oozeBlocksOrBlocked.put(oozeMor,relatedCreatures);
      }
    }
    if (blocker != null && blocker.getName().equals("String_Node_Str")) {
      if (attacker != null && hasAttachedEquipment(game,attacker)) {
        MageObjectReference oozeMor=new MageObjectReference(blocker,game);
        HashSet<MageObjectReference> relatedCreatures=oozeBlocksOrBlocked.getOrDefault(oozeMor,new HashSet<>());
        relatedCreatures.add(new MageObjectReference(event.getTargetId(),game));
        oozeBlocksOrBlocked.put(oozeMor,relatedCreatures);
      }
    }
  }
  if (game.getTurn().getPhaseType().equals(TurnPhase.COMBAT)) {
    if (event.getType() == GameEvent.EventType.ZONE_CHANGE) {
      if (((ZoneChangeEvent)event).getFromZone().equals(Zone.BATTLEFIELD)) {
        for (        Map.Entry<MageObjectReference,HashSet<MageObjectReference>> entry : oozeBlocksOrBlocked.entrySet()) {
          for (          MageObjectReference mor : entry.getValue()) {
            if (mor.refersTo(((ZoneChangeEvent)event).getTarget(),game)) {
              for (              UUID attachmentId : ((ZoneChangeEvent)event).getTarget().getAttachments()) {
                Permanent attachment=game.getPermanent(attachmentId);
                if (attachment != null && attachment.hasSubtype(SubType.EQUIPMENT,game)) {
                  HashSet<MageObjectReference> toDestroy=oozeEquipmentsToDestroy.getOrDefault(entry.getKey(),new HashSet<>());
                  toDestroy.add(new MageObjectReference(attachment,game));
                  oozeEquipmentsToDestroy.put(entry.getKey(),toDestroy);
                }
              }
            }
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
@Override public void watch(GameEvent event,Game game){
  if (event.getType() == GameEvent.EventType.BEGIN_COMBAT_STEP_PRE) {
    this.oozeBlocksOrBlocked.clear();
  }
  if (event.getType() == GameEvent.EventType.BLOCKER_DECLARED) {
    Permanent attacker=game.getPermanent(event.getTargetId());
    Permanent blocker=game.getPermanent(event.getSourceId());
    if (attacker != null && attacker.getName().equals("String_Node_Str")) {
      if (blocker != null && hasAttachedEquipment(game,blocker)) {
        MageObjectReference oozeMor=new MageObjectReference(attacker,game);
        HashSet<MageObjectReference> relatedCreatures=oozeBlocksOrBlocked.getOrDefault(oozeMor,new HashSet<>());
        relatedCreatures.add(new MageObjectReference(event.getSourceId(),game));
        oozeBlocksOrBlocked.put(oozeMor,relatedCreatures);
      }
    }
    if (blocker != null && blocker.getName().equals("String_Node_Str")) {
      if (attacker != null && hasAttachedEquipment(game,attacker)) {
        MageObjectReference oozeMor=new MageObjectReference(blocker,game);
        HashSet<MageObjectReference> relatedCreatures=oozeBlocksOrBlocked.getOrDefault(oozeMor,new HashSet<>());
        relatedCreatures.add(new MageObjectReference(event.getTargetId(),game));
        oozeBlocksOrBlocked.put(oozeMor,relatedCreatures);
      }
    }
  }
  if (event.getType() == GameEvent.EventType.ZONE_CHANGE) {
    if (((ZoneChangeEvent)event).getFromZone().equals(Zone.BATTLEFIELD)) {
      if (game.getTurn() != null && TurnPhase.COMBAT.equals(game.getTurn().getPhaseType())) {
        for (        Map.Entry<MageObjectReference,HashSet<MageObjectReference>> entry : oozeBlocksOrBlocked.entrySet()) {
          for (          MageObjectReference mor : entry.getValue()) {
            if (mor.refersTo(((ZoneChangeEvent)event).getTarget(),game)) {
              for (              UUID attachmentId : ((ZoneChangeEvent)event).getTarget().getAttachments()) {
                Permanent attachment=game.getPermanent(attachmentId);
                if (attachment != null && attachment.hasSubtype(SubType.EQUIPMENT,game)) {
                  HashSet<MageObjectReference> toDestroy=oozeEquipmentsToDestroy.getOrDefault(entry.getKey(),new HashSet<>());
                  toDestroy.add(new MageObjectReference(attachment,game));
                  oozeEquipmentsToDestroy.put(entry.getKey(),toDestroy);
                }
              }
            }
          }
        }
      }
    }
  }
}