Only remove actualy failed blocks from setBlockIndexValid

src/main.cpp

@@ -2073,7 +2073,7 @@ static CBlockIndex* FindMostWorkChain() {
         CBlockIndex *pindexTest = pindexNew;
         bool fInvalidAncestor = false;
         while (pindexTest && !chainActive.Contains(pindexTest)) {
-            if (!pindexTest->IsValid(BLOCK_VALID_TRANSACTIONS) || !(pindexTest->nStatus & BLOCK_HAVE_DATA)) {
+            if (pindexTest->nStatus & BLOCK_FAILED_MASK) {
                 // Candidate has an invalid ancestor, remove entire chain from the set.
                 if (pindexBestInvalid == NULL || pindexNew->nChainWork > pindexBestInvalid->nChainWork)
                     pindexBestInvalid = pindexNew;
@@ -2083,6 +2083,7 @@ static CBlockIndex* FindMostWorkChain() {
                     setBlockIndexValid.erase(pindexFailed);
                     pindexFailed = pindexFailed->pprev;
                 }
+                setBlockIndexValid.erase(pindexTest);
                 fInvalidAncestor = true;
                 break;
             }