I'll show an easy example here
Equip any legendary canister on the EV2 (3 shard slots) and then equip the Proton Cannon Insulator shard (maxed, decreases Proton Charge heat generation rate by 20%), this will show that the cost of Proton Charge is 16 heat. Then equip the Celebration weapon and notice that your Proton Charge cost is now 20 again despite having the shard equipped.
This is the easiest example for showing this bug, but no shard I tested works for the first slot of Wayfarer weapons. Regular weapons work just fine.Expected Results: Our new additional shard slot should be an actual slot, not just a visual slot.