Some synergies with poison and companion. Bug or intended?

Hello, im playing druid with some poison and companion skills.
In my tests i’ve seen some synergies that don’t work like i thought they should and i’m not sure if it’s a bug. I list some:

  1. Poison Creeper pasive damage doesn´t work with Aspect of Changeling`s debt

  2. Tracker Glyph additional bonus increase the duration of your poison, but the effect does not reflect an increase in the total damage of the poison

  3. Im not sure if Aspect of the wildrage works with other companion that are not wolves.
    the damage effect is applied regardless of whether you have the legendary, not sure if with the legendary it is applied again.

  4. Werewolf companions are heavily buggy and their attack animations feel sluggish and inconsistent for the pace of combat.