Why (17, 4) appears in MC world?

## Type of Issue

Select the type of issue:
- [ ] Bug report (to report a bug)
- [ ] Feature request (to request an additional feature)
- [ ] Tracker (I am just using this as a tracker)
- [ ] Refactor request
- [ ] Documentation Ask

## Description

Block with idm (17, 4) appears in the world. It's not supposed to be in the MC version we are using.

## Current Behavior

Log:
```
2021-02-22 01:27:20,950 [loco_mc_agent.py:193 - handle_exception() ERROR]: Default handler caught exception, db_log_idx=103058
Traceback (most recent call last):
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/core.py", line 18, in start
self.step()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/loco_mc_agent.py", line 217, in step
super().step()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/core.py", line 26, in step
self.controller_step()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/loco_mc_agent.py", line 272, in controller_step
self.perceive(force=True)
File "craftassist_agent.py", line 172, in perceive
v.perceive(force=force)
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/heuristic_perception.py", line 575, in perceive
type_name = BLOCK_DATA["bid_to_name"][idm]
KeyError: (17, 4)
Traceback (most recent call last):
File "craftassist_agent.py", line 332, in
sa.start()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/core.py", line 20, in start
self.handle_exception(e)
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/loco_mc_agent.py", line 212, in handle_exception
raise e
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/core.py", line 18, in start
self.step()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/loco_mc_agent.py", line 217, in step
super().step()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/core.py", line 26, in step
self.controller_step()
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/../../base_agent/loco_mc_agent.py", line 272, in controller_step
self.perceive(force=True)
File "craftassist_agent.py", line 172, in perceive
v.perceive(force=force)
File "/private/home/yuxuans/Workspace/tmp/droidlet/craftassist/agent/heuristic_perception.py", line 575, in perceive
type_name = BLOCK_DATA["bid_to_name"][idm]
KeyError: (17, 4)
```