Diana Passive Bug

So essentially, Diana passive seems to be bugged in its stacking manner. Seeing as it's a three stack buff - two autos then passive auto - you'd think it'd only be able to stack twice, but I seemed to be able to get it stack three times and to get it to stack continuously once at three stacks, just refreshing it. The way I did this was to wait until the nearly last second of the buff on my hotbar and wait then attack before it has a chance to expire. It doesn't really require precise timing either, just needs to be pretty close. I can provide video evidence of it, but you'd probably be able to replicate it without much effort. It only really matters in farming and maybe if you wanna engage at the very last second, but that's probably pretty rare. Thanks in advance!