Issue decripted here: https://community.ipfire.org/t/webproxy-wpad-configuration-file-double-definitions/8736 Subnets of the blue network are pointed to the proxy of the green network. However this issue accurs with the activation of the proxy for the green network.
As this bug is related to IPFire-2.x then the component should always be --- as per the IPFire bug reporting documentation.