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add IsUnearthed for Card check and CardUtil.getLKICopy does copy Unearthed too
when a Creature is exiled because of Unearth, use LKI for the ChangesZone Trigger

forge-game/src/main/java/forge/game/GameAction.java

@@ -233,6 +233,7 @@ public class GameAction {
 
             if (c.isUnearthed() && (zoneTo.is(ZoneType.Graveyard) || zoneTo.is(ZoneType.Hand) || zoneTo.is(ZoneType.Library))) {
                 zoneTo = c.getOwner().getZone(ZoneType.Exile);
+                lastKnownInfo = CardUtil.getLKICopy(c);
                 c.setUnearthed(false);
             }
         }

forge-game/src/main/java/forge/game/card/Card.java

@@ -5151,6 +5151,10 @@ public class Card extends GameEntity implements Comparable<Card> {
             if (isMonstrous()) {
                 return false;
             }
+        } else if (property.equals("IsUnearthed")) {
+            if (!isUnearthed()) {
+                return false;
+            }
         } else if (property.equals("IsRenowned")) {
             if (!isRenowned()) {
                 return false;

forge-game/src/main/java/forge/game/card/CardUtil.java

@@ -288,6 +288,8 @@ public final class CardUtil {
             newCopy.addImprintedCard(o);
         }
 
+        newCopy.setUnearthed(in.isUnearthed());
+
         newCopy.setChangedCardColors(in.getChangedCardColors());
         newCopy.setChangedCardKeywords(in.getChangedCardKeywords());
         newCopy.setChangedCardTypes(in.getChangedCardTypes());