Adding or Removing Insulation to Pipe

After Modelling Plumbing service, If i do add or remove Insulation, the connection,fittings are removed. Moreover No Insulation Added/Removed.

See the Image. 

If Those Insulation settings in DataGroup Instance Data Dialog box Applied Before starting Model, Insulation are came. But After Modelling i can not add/Remove Insulation why?

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