True Shapeshifter (Level 20 Druid feat) says
...While under the effect of Wild Shape, you can change into any of the other forms on your Wild Shape list...
I am wondering if this triggers Healing Transformation
... If your next action is to cast a non-cantrip polymorph spell that targets only one creature... restores hitpoints...
I am figuring that casting Wild Shape triggers Healing Transformation, because it uses focus, but is True Shapeshifter triggering Wild Shape and thus Healing Transformation?