> Flasks with this modifier are no longer queued while a stronger effect is active
Just to clarify, the same flask (hence same effect) is still queued, correct?
So if you have multiple mana flask effects on you (because you've used multiple mana flasks, or used one mana flask multiple times in quick succession), they will queue
Queueing is the same thing regardless of whether the other effects came from the same flasks or no. Enduring Flasks do not queue.