From 51763f6b0d59886d09a004bdb5d875bb75e93aef Mon Sep 17 00:00:00 2001
From: Po <chenjunfeng@ethstorage.io>
Date: Sat, 20 Jul 2024 07:58:30 +0000
Subject: [PATCH] Fix _findExecTraceAncestor() with ancestorPos_

---
 packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol b/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol
index 8153ab0d464c..c7e00ab3fffa 100644
--- a/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol
+++ b/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol
@@ -1100,7 +1100,7 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, ISemver {
         if (ancestorPos_.depth() == SPLIT_DEPTH + N_BITS) {
             ancestorClaim_ = ancestorClaimRoot;
         } else {
-            ancestorClaim_ = getClaim(ancestorClaimRoot.raw(), Position.wrap(_pos.raw() - 1), _daItem);
+            ancestorClaim_ = getClaim(ancestorClaimRoot.raw(), ancestorPos_, _daItem);
         }
     }