Surpassing Chance Does Not Allow Toxic Growth to Fire Extra Arrows and Pods Even With +Limit Pods

Hi, I am playing Toxic Growth and have been using bows with Surpassing Chance to fire another arrow while leveling. I have finally noticed that when I look and test, I never fire an extra arrow. I have 75% Surpassing chance, and with TG Gem Quality I have fires 6 Pods, and 14 Pod limit. Whether I fire 1 or 2 arrows, it only ever procs the fires x pods amount.

So this begs the question, is this a bug or is it by design that I can never fire more pods than the Fires x pods limit allows, even with multiple arrows? I feel like logically the Fires x Pods limit should be per arrow, not per volley, and the total Pod Limit should be the cap for entire volley. Because if my pods explode immediately then I am only ever firing and exploding 6 pods at a time, and the 14 Pod limit is an arbitrary limit I can never reach unless my damage is so bad that I cannot proc pods fast enough. I can't remember if it worked like this last League with multiple arrows, but with the lower pod per volley cap now it definitely hurts.