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After a little more investigation, I found that the bug occurs when the following two conditions are met:
ZoneHVAC:TerminalUnit:VariableRefrigerantFlowin the AirLoop andZoneHVAC:TerminalUnit:VariableRefrigerantFlowin some zones are connected to the sameAirConditioner:VariableRefrigerantFlow- There is another
AirLoopHVACwhich does not haveZoneHVAC:TerminalUnit:VariableRefrigerantFlow.

I have narrowed down the cause of the bug to 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:VariableRefrigerantFlowin the AirLoop andZoneHVAC:TerminalUnit:VariableRefrigerantFlowin some zones are connected to the sameAirConditioner:VariableRefrigerantFlow- There is another
AirLoopHVACwhich does not haveZoneHVAC:TerminalUnit:VariableRefrigerantFlow.

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