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(I'm playing a modded save that renames copper cable to Electrical Cable (since one recipe makes it from aluminium). I'm unsure if that is relevant.)

When I'm trying to craft a Constant Combinator, it shows that it needs 5x Cable, 2x Circuit, but despite having a stack of copper plates and circuits in my inventory, it does not see that it can craft it with the already present materials; it is instead trying to craft the circuits via an alternative recipe requiring solder.

When I manually craft the Copper Plates into Electrical Cable it does allow me to craft the constant combinator from its direct materials.

Edit: I just realized the default recipe is still NAMED 'Copper Cable'. Possibly this is the issue?

So turns out (according to the devs) that this is a result of one of the involved mods (foliax) assuming that the default circuit recipe will not be used. Foliax is made to work as an alternative planet to start on, and thanks to that the original circuit recipe is assumed to be used less in hand-crafting.