Unless this is somehow intended behaviour, gold is able to be sparked if there is exactly 3 pixels between it and another metal, Even if insulation is inbetween! Here is an example:https://powdertoy.co.uk/Browse/View.html?ID=3266574
I see, although the wording is a little off. On the page it states: "is able to conduct across up to a 3 pixel gap", That isnt true it ONLY conducts to a 3 pixel gap. Not 2 or 1(if there is insulation between atleast). It also doesnt say things can conduct to it from that 3 pixel gap, just that it can conduct across that gap. In the attached save INWR(You can replace this with PSCN, METL, NTCT, ect ect) conducts to the gold but the gold will not conduct to it. Gold will not conduct to another metal except gold across that 3 pixel gap.