So, typical Wednesday, I log my accounts and go to war. I’m in a small alliance, so it’s only a 2v2 war.
One of the defense teams has Evelyn, a green 5-star hero with an “elemental link” ability that heals all heroes that share a color with her for 4% health every turn.
When her special goes off, all heroes, including non-green heroes on the defense team, receive the buff and are healing 4% of their health each turn.
I have Evelyn on one of my two accounts, and tried to duplicate it on offense by running s1:8-7 with a rainbow team, but none of my other heroes received the elemental link. This leads me to believe the bug can only be duplicated on a defense team.
I then went to raids, re-rolled about 200 times until I found a defense team with Evelyn on it. Triggered her special by hitting her with enough shields, and she did not spread the buff to non-green allies. Therefore, I can only assume that this bug is glitched in wars.