When a diode is placed over a connection point, this point gets removed so that it isn't visible behind the diode. When the diode is removed again, the point can be restored on T-crossings but won't appear again in full crossings, making them two separate wires. To fix this, the information that there's a connection point at that position has to be saved somewhere to later restore the point.
SimonBuxx
commented
6 years ago
When a diode is placed over a connection point, this point gets removed so that it isn't visible behind the diode. When the diode is removed again, the point can be restored on T-crossings but won't appear again in full crossings, making them two separate wires. To fix this, the information that there's a connection point at that position has to be saved somewhere to later restore the point.