Certain spells don't have proper triggering mechanics.
What kind of bug is it? (Quest, Class, Spell, PvE)
Spell issue.
How can you reproduce it?
Try to trigger effects of Crystal Spire of Karabor, Shattered Sun Pendant of Restoration or Fel Reaver's Piston by healing with Earth Shield or Nature's Guardian (shaman talent). You can also try to proc Memento of Tyrande's effects with Renew or Rejuvenation.
Please describe, in detail, what is suppose to occur when this bug happens:
You are supposed to trigger effects from items like Crystal Spire of Karabor, Shattered Sun Pendant of Restoration or Fel Reaver's Piston with healing spells like Earth Shield or Nature's Guardian (Shaman talent). Memento of Tyrande's effect should proc from all healing spells, but in fact it only procs off direct healing spells like Regrowth (its direct healing effect) or Flash of Light.
Please describe, in detail, what happens when it bugs up, and how it's malfunctioning:
Memento of Tyrande is supposed to proc from all healing spells but it procs off direct healing spells only. Earth Shield and Nature's Guardian are direct healing effects and according to wowhead comments they are supposed to trigger effects from Shattered Sun Pendant of Restoration, Crystal Spire of Karabor and Fel Reaver's Piston. Shattered Sun Pendant of Restoration is supposed to proc off HealingOverTime spells which actually do healing.
Evidence providing proof of bug:
Some tooltips
