Gem Studded with Weapon Granted Skills

Support gems placed in weapon granted skills (like a spear's spear stab / spear throw) only count towards gem studded while in that weapon swap. This can be tested using blue support gems and looking at your skill's mana cost based on your weapon swap.

For example if you have 4 blue and 4 green support gems, but one is placed in the spear's inherent spear stab skill, when swapping to the other weapon set you will not have the ascendancy's 30% less skill cost benefits, but you will have it when swapping back to the spear.

This behaviour only seems to be the case for skills granted by weapons. As far as I can tell skills that are only allocated to one of two weapon swaps don't have this behaviour so I assume it being the case for weapon granted skills is unintended.

As an addendum to this, the problem also occurs when you have a skill whose attribute requirements are only met in one of your weapon sets. The gems socketed in that skill will not count towards gem studded when using the weapon set who does not meet that skill's attribute requirements.