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Self-resolved! If we want to do Coincident plant sizing for both chilled water loop and condenser water loop, we should choose Coincident for chilled water loop and NonCoincident for condenser water loop. This setting provides Coincident sizing results of cooling towers and condener water pumps.

Sizing:Plant,
    CHWloop Chilled Water Loop,  !- Plant or Condenser Loop Name
    Cooling,                 !- Loop Type
    6.7,                     !- Design Loop Exit Temperature {C}
    6.3,                     !- Loop Design Temperature Difference {deltaC}
    Coincident,              !- Sizing Option
    ,                        !- Zone Timesteps in Averaging Window
    None;                    !- Coincident Sizing Factor Mode

Sizing:Plant,
    CHWloop Condenser Water Loop,  !- Plant or Condenser Loop Name
    Condenser,               !- Loop Type
    29,                      !- Design Loop Exit Temperature {C}
    5.6,                     !- Loop Design Temperature Difference {deltaC}
    NonCoincident,           !- Sizing Option
    ,                        !- Zone Timesteps in Averaging Window
    None;                    !- Coincident Sizing Factor Mode

The bug should be fixed or the input method should be added in I/O Reference.