Per the 2.0 patch notes:
This is not happening. During the Lux raid, I use GEH heal on turn 2 and it heals the already full health Tryo (4200/4200 HP) instead of the 5118/5953 HP Max or the 6038/6873 HP Thor. According the notes, it shouldn’t be healing the full HP creature.
Steps to reproduce:
Follow this chart here:
Here’s a screen shot showing the bug: