[Gamplay] Pet basic attack interaction discrepancy

I have tested most of the pets in the game and how their basic attack interacts with Liandry's Torment, Hextech Gunblade, and Ravenous Hunter rune. I have recorded the results in this google doc excel sheet:

https://docs.google.com/spreadsheets/d/1xb3mrEWncou_NOfu1dY7MPsQf1QMy6DmoNnrteb6aHw/edit#gid=0

I have highlighted in red the values that I believe to be out of ordinary. The main problem here is with Malzahar, whose voidlings provides no healing via Hextech Gunblade or Ravenous Hunter rune, even though based on most other pet interactions, they should provide full value healing. This is causing Malzahar to miss out on significant amount of healing from the Ravenous Hunter rune.

Steps to reproduce for Ravenous Hunter testing:

1. Go to practice mode, select the champion you wish to test, equip Ravenous Hunter rune.
2. Max out on levels and get some items that their pet damage scale off of.
3. Take a few tower shots but don't die.
4. Spawn an enemy dummy.
5. Spawn their pet and let their pet attack the dummy for a pre determined amount of time, do not damage the dummy in other ways.
6. Note down the HP value of the champion before and after the time, the cumulated damage on the dummy, and the time.
7. Subtract base healing (base healing per sec * time) from the HP difference.
8. Divide the remaining healing by the cumulated damage on dummy, compare the ratio with your current Ravenous Hunter healing ratio to see if the pet provided full, reduced (1/3), or no healing.