Description: The tear of the goddess item is intended to have a 3s cooldown before another stack of maximum mana is granted to the player. However, there are two problems:

1. Each time a spell is cast, +4 maximum mana is granted to the player irregardless of how recent another stack had been added.

2. Each time a spell is cast, the animation of the tear cooldown is reset.

I assume that the intended behavior of the item is to limit the mana gain rate to +4 per 3 seconds (at least). Also, the cooldown animation for the tear (in the inventory bar) should never reset.

Repro steps:
1. Pick Cassiopeia (not confirmed for other characters) on any map.
2. Purchase a Tear.
3. Make note of the initial max mana gained.
4. Cast Q and then W immediately after.
5. Make note of the new max mana gained.

Its not a bug. You can get three (or maybe four) stacks before you actually have to wait the 3 seconds. This is for the convenience of the player so they can use abilities in rapid combo. Riot did intend for it to work this way.

Yeah, saw this behavior on swain when i ulted for a few seconds. Even if it was unintended, for people like him who have long cooldowns, it makes the tear charge better than an ungodly slow rate.

Happens a lot on nid