If a battleground from one side’s battleground deck is reactivated from the other side’s scoring area, the battleground’s icons are ignored — they do not cancel out the attackers’ icons.

For example, if Dol Guldur is reactivated from the Free Peoples’ scoring area, the Shadow players do not get the benefit of its icons during combat resolution; however, the Shadow players are still be considered the defenders, and Dol Guldur’s activation text is still resolved.