JHermann already verified this in another post but if you’re farming planet specific crystals they need to be from the invadable node on that planet. The node that has the little gold/yellow trim around the bottom of it. That is where that planet specific crystal will drop from. If you’re farming other, non-invadable nodes stop what you’re doing and farm the invadable ones. As for the contested territory I’m sure the planetary crystals can drop in there as well so if you’re farming and you want the Europa crystal and Mars is the contested territory providing Europa has a node with the gold/yellow trim (invadable) you can get the Europa crystal from there and the Mars crystal from the contested territory. Once you know the correct way to farm them you just need to pray to RNGesus so they drop.