Not sure if this is a bug or a wrong tooltip, but… according to its description Consecrated Ground (typo in game btw, see linked screenshot) should gain 1 spell damage per 5% increased healing effectiveness.
You can pretty much see my entire tree and the damage consecrated ground does (in my case it’s an aura).
However, whether I increase healing effectiveness through passives or gear, it has zero effect on the damage shown here, and also not on the damage shown when hovering over the icon in the action bar.
I also did some testing in game and it doesn’t seem to have any invisible effect either…
https://drive.google.com/file/d/1FbH0o-AKbot16MzB1Lp48mZw1JBrPEFO/view?usp=share_link