Found out about this the other day when I got my brutal idol.
If you press lifebloom the same time u press ur idol it the final healing value will be healed for as if u got 0+ healing.
For example if I change from brutal gladiator's idol to any other idol it will heal for exactly 600 no matter how much healing you have. And if u switch from any idol to the brutal one it will heal for exactly 731.
Images
Image of Lifebloom bug - Photobucket - Video and Image Hosting
Image of Lifebloom bug - Photobucket - Video and Image Hosting