The stone roof used for castles is bugged

Summary: i design a building that includes the stone roof material and the people start building it was all fine, building the walls and columns but when they get to the roof they stop building.
Steps to reproduce:

  1. design a building with stone roof the one used for castles
  2. build it
    3)the workers stop building
Expected Results: be solved Actual Results: no one Notes: Attachments: Version Number and Mods in use: no mods , Alpha 17 downloadby steam System Information: game run on 32 bits when the city grows because it turns slowly. 64 bits, 8 Ram, Intel core 8

Can you upload a save fo the game that has that building or the template for it? The davs need a save file or template to diagnose the problem

Thank u for your attention the bug is already fixed