Hello! For more than a month and in different game modes, sometimes an icon appears in the fight next to the bonuses and weaknesses of my characters (see white arrow in the images). When fighting some tech champions, I get a tech icon but in red, which is the usual color for debuffs. Pausing the game does not show any information about it.
I don't know if it's a visual error, or if it's been reported already (I've searched, but didn't find anything), if it means something but it's not available in my language... It's happened to me both in alliance war, and in Battleground (I forgot take capture, since it was the first time) or sand, so I don't think it has anything to do with the synergies...

