voltage inside the conductor is calculated

The voltage inside the conductor ist not constant. Conductor diameter is 3 cm. Position 7.8 / 20.

My guess is: a line charge in the center of the conductor is used to calculate the field.

How to solve:

• display the conductor with correct dimensions and filling (on top of all other lines)
• do not calculate / display the voltage inside the the conductor boundaries.

My guess would be, that this does not only apply for voltage, but also other plots as well.