Multiagent is not valid in ProcThor Scene

```
import prior
from ai2thor.controller import Controller

dataset = prior.load_dataset("procthor-10k")
house = dataset['train'][0]

c = Controller(scene=house, height=640, width=640, fieldOfView=90, agentCount=2)

#c.reset(agentCount=5) => not work
#e = c.step(action="Initialize",raise_for_failure=True,**c.initialization_parameters,) => not work
```

How to add multiagent in procthor scene?

+edit
1. I noticed that there is an if statement on line 301 of the AgentManager.cs script in the AI2-THOR GitHub repository (https://github.com/allenai/ai2thor/blob/63947e75d0762101a141d079a4a2737f7a4656f3/unity/Assets/Scripts/AgentManager.cs#L301). If I were to passively delete this statement, would it cause any issues?

2. I am curious to know whether it is feasible to synchronize the movements of all agents simultaneously

Thank you