diff --git a/org.eclipse.jgit.packaging/pom.xml b/org.eclipse.jgit.packaging/pom.xml
index 6fcf67402..5e9e41e16 100644
--- a/org.eclipse.jgit.packaging/pom.xml
+++ b/org.eclipse.jgit.packaging/pom.xml
@@ -294,7 +294,7 @@
         <plugin>
           <groupId>org.eclipse.cbi.maven.plugins</groupId>
           <artifactId>eclipse-jarsigner-plugin</artifactId>
-          <version>1.1.5</version>
+          <version>1.3.2</version>
         </plugin>
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/FileReftableTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/FileReftableTest.java
index 33bacbe3e..8bab8e35a 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/FileReftableTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/FileReftableTest.java
@@ -25,7 +25,9 @@
 import static org.junit.Assert.fail;
 
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.List;
@@ -129,20 +131,21 @@ public void testConvert() throws Exception {
 		assertTrue(db.getRefDatabase().hasFastTipsWithSha1());
 	}
 
+
 	@Test
-	public void testConvertToRefdir() throws Exception {
+	public void testConvertBrokenObjectId() throws Exception {
 		db.convertToPackedRefs(false, false);
-		assertTrue(db.getRefDatabase() instanceof RefDirectory);
-		Ref h = db.exactRef("HEAD");
-		assertTrue(h.isSymbolic());
-		assertEquals("refs/heads/master", h.getTarget().getName());
+		new File(db.getDirectory(), "refs/heads").mkdirs();
 
-		Ref b = db.exactRef("refs/heads/b");
-		assertFalse(b.isSymbolic());
-		assertTrue(b.isPeeled());
-		assertEquals(bCommit, b.getObjectId().name());
+		String invalidId = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef";
+		File headFile = new File(db.getDirectory(), "refs/heads/broken");
+		try (OutputStream os = new FileOutputStream(headFile)) {
+			os.write(Constants.encodeASCII(invalidId + "\n"));
+		}
 
-		assertFalse(db.getRefDatabase().hasFastTipsWithSha1());
+		Ref r = db.exactRef("refs/heads/broken");
+		assertNotNull(r);
+		db.convertToReftable(true, false);
 	}
 
 	@Test
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java
index 009914b35..46df0011f 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java
@@ -803,6 +803,12 @@ public void logScan() throws IOException {
 			}
 			assertFalse(lc.next());
 		}
+
+		for (Ref exp : refs) {
+ 			try (LogCursor lc = t.seekLog(exp.getName())) {
+				assertTrue("has " + exp.getName(), lc.next());
+			}
+		}
 	}
 
 	@Test
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileReftableDatabase.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileReftableDatabase.java
index e613a5806..c7053a16f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileReftableDatabase.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileReftableDatabase.java
@@ -26,6 +26,7 @@
 import java.util.stream.Collectors;
 
 import org.eclipse.jgit.annotations.NonNull;
+import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.events.RefsChangedEvent;
 import org.eclipse.jgit.internal.storage.reftable.MergedReftable;
 import org.eclipse.jgit.internal.storage.reftable.ReftableBatchRefUpdate;
@@ -582,15 +583,20 @@ private static Ref refForWrite(RevWalk rw, Ref r) throws IOException {
 					r.getTarget().getName(), null));
 		}
 		ObjectId newId = r.getObjectId();
-		RevObject obj = rw.parseAny(newId);
 		RevObject peel = null;
-		if (obj instanceof RevTag) {
-			peel = rw.peel(obj);
+		try {
+			RevObject obj = rw.parseAny(newId);
+			if (obj instanceof RevTag) {
+				peel = rw.peel(obj);
+			}
+		} catch (MissingObjectException e) {
+			/* ignore this error and copy the dangling object ID into reftable too. */
 		}
 		if (peel != null) {
-			return new ObjectIdRef.PeeledTag(PACKED, r.getName(), newId,
-					peel.copy());
-		}
+				return new ObjectIdRef.PeeledTag(PACKED, r.getName(), newId,
+						peel.copy());
+			}
+
 		return new ObjectIdRef.PeeledNonTag(PACKED, r.getName(), newId);
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
index 009631289..d07713db8 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
@@ -59,7 +59,6 @@
 class BlockReader {
 	private byte blockType;
 	private long endPosition;
-	private boolean truncated;
 
 	private byte[] buf;
 	private int bufLen;
@@ -79,10 +78,6 @@ byte type() {
 		return blockType;
 	}
 
-	boolean truncated() {
-		return truncated;
-	}
-
 	long endPosition() {
 		return endPosition;
 	}
@@ -298,16 +293,8 @@ private void parseBlockStart(BlockSource src, long pos, int fileBlockSize)
 			// Log blocks must be inflated after the header.
 			long deflatedSize = inflateBuf(src, pos, blockLen, fileBlockSize);
 			endPosition = pos + 4 + deflatedSize;
-		}
-		if (bufLen < blockLen) {
-			if (blockType != INDEX_BLOCK_TYPE) {
-				throw invalidBlock();
-			}
-			// Its OK during sequential scan for an index block to have been
-			// partially read and be truncated in-memory. This happens when
-			// the index block is larger than the file's blockSize. Caller
-			// will break out of its scan loop once it sees the blockType.
-			truncated = true;
+		} else if (bufLen < blockLen) {
+			readBlockIntoBuf(src, pos, blockLen);
 		} else if (bufLen > blockLen) {
 			bufLen = blockLen;
 		}
@@ -372,7 +359,7 @@ private void setupEmptyFileBlock() {
 	}
 
 	void verifyIndex() throws IOException {
-		if (blockType != INDEX_BLOCK_TYPE || truncated) {
+		if (blockType != INDEX_BLOCK_TYPE) {
 			throw invalidBlock();
 		}
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
index 095276f57..1e7885578 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
@@ -435,7 +435,7 @@ private BlockReader readBlock(long pos, long end) throws IOException {
 
 		BlockReader b = new BlockReader();
 		b.readBlock(src, pos, sz);
-		if (b.type() == INDEX_BLOCK_TYPE && !b.truncated()) {
+		if (b.type() == INDEX_BLOCK_TYPE) {
 			if (indexCache == null) {
 				indexCache = new LongMap<>();
 			}
diff --git a/pom.xml b/pom.xml
index 84aa57668..f36a20fc7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -321,7 +321,7 @@
         <plugin>
           <groupId>org.eclipse.cbi.maven.plugins</groupId>
           <artifactId>eclipse-jarsigner-plugin</artifactId>
-          <version>1.1.7</version>
+          <version>1.3.2</version>
         </plugin>
         <plugin>
           <groupId>org.eclipse.tycho.extras</groupId>