What bias? It's only offside if Sardar touched the ball, for which we have no visual confirmation. See 1:15 here:
Number 19 is in offside but he has no role in the play though one can argue he was close enough to have a role. The handball is another issue and more justifiable. But in any case this was too close to be called on the field at a time when you have VAR. They should have let the goal stand and then reviewed by VAR, in which case I think it would have remained a goal.