This pot has 2 pins to connect the case to ground: C388855
![image.png](//image.easyeda.com/pullimage/zF6rWkXDPSF9SE5UrnFzNl0iG5qfhluKGVJCfzps.png)
If it is placed in the schematic with all pins visible and converted to PCB then the two case pins connected to ground are connected on the PCB:
![image.png](//image.easyeda.com/pullimage/1NvgCe8A3C9bTBvZIZrBGw6m4tPotGzPbDn6qFDQ.png)
![image.png](//image.easyeda.com/pullimage/VbOX6vf8aRh9iMRhHubjRRwq5rwaEvFzPUvg9NXx.png)
If the pins are then hidden and the PCB Updated, their connections to ground are lost!
![image.png](//image.easyeda.com/pullimage/OEXP8SfmEiDXJ1rNg1qq1KQJUiXo6flp4fANhk50.png)
![image.png](//image.easyeda.com/pullimage/mKGzR1ldN7NofOUrm2UdidH0A7RfReK6yXbBO5s7.png)
Chrome
80.0.3987.132
Windows
10
EasyEDA
6.3.22