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After a little more investigation, I found that the bug occurs when the following two conditions are met:

• ZoneHVAC:TerminalUnit:VariableRefrigerantFlow in the AirLoop and ZoneHVAC:TerminalUnit:VariableRefrigerantFlow in some zones are connected to the same AirConditioner:VariableRefrigerantFlow
• There is another AirLoopHVAC which does not have ZoneHVAC:TerminalUnit:VariableRefrigerantFlow.

I have narrowed down the cause of the bug ro some extent, which is OK for me for now.

After a little more investigation, I found that the bug occurs when the following two conditions are met:

• ZoneHVAC:TerminalUnit:VariableRefrigerantFlow in the AirLoop and ZoneHVAC:TerminalUnit:VariableRefrigerantFlow in some zones are connected to the same AirConditioner:VariableRefrigerantFlow
• There is another AirLoopHVAC which does not have ZoneHVAC:TerminalUnit:VariableRefrigerantFlow.

I have narrowed down the cause of the bug ro to some extent, which is OK for me for now.