The support Always Watching has a bug where, when the support is removed from the board, the effects, the +2/+2 and Vigilance.
It wouldn’t be near as bad if the text of the card didn’t literally spell out for us that the effect ends when the card is no longer on the board.
Supports that give status buffs are supposed to work that way. Once they are destroyed, then so are their benefits.
Edit: I think you meant to say in the original post that the effects remain even after the support is destroyed. Which is a bug if so.
Your edit was what I was intending to say.