Program: 46798
Project: 46798
Buggy source:
private void runDb() throws Exception {
  final Database dbBlogEntries=getEnvironment().openDatabase(null,"String_Node_Str",dbConfig);
  final BdbMapDao<Blog.BlogEntry> blogEntryMap=new ProtobufBdbMapDaoSupport<>(dbBlogEntries,(k,v) -> Blog.BlogEntry.parseFrom(v.getData()));
  final ByteString key=ByteString.copyFrom("String_Node_Str",StandardCharsets.UTF_8);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  Blog.BlogEntry actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
  withTransactionVoid((tx) -> blogEntryMap.put(tx,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build()));
  actualValue=withTransaction((tx) -> blogEntryMap.get(tx,key));
  log.info("String_Node_Str",actualValue);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
  blogEntryMap.delete(null,key);
  actualValue=blogEntryMap.get(null,key,Blog.BlogEntry::getDefaultInstance);
  log.info("String_Node_Str",actualValue);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
}

Fixed version (ground truth):
private void runDb() throws Exception {
  final Database dbBlogEntries=getEnvironment().openDatabase(null,"String_Node_Str",dbConfig);
  final BdbMapDao<Blog.BlogEntry> blogEntryMap=new ProtobufBdbMapDaoSupport<>(dbBlogEntries,(k,v) -> Blog.BlogEntry.parseFrom(v.getData()),LockMode.READ_COMMITTED);
  final ByteString key=ByteString.copyFrom("String_Node_Str",StandardCharsets.UTF_8);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  Blog.BlogEntry actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
  if (actualValue.getTitle().startsWith("String_Node_Str")) {
    final DatabaseEntry entry=new DatabaseEntry(key.toByteArray());
    DatabaseEntry value=new DatabaseEntry(Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build().toByteArray());
    dbBlogEntries.put(null,entry,value);
    final DatabaseEntry out=new DatabaseEntry();
    dbBlogEntries.get(null,entry,out,LockMode.READ_COMMITTED);
    log.info("String_Node_Str",Blog.BlogEntry.parseFrom(out.getData()));
  }
  withTransactionVoid((tx) -> blogEntryMap.put(tx,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build()));
  actualValue=withTransaction((tx) -> blogEntryMap.get(tx,key));
  log.info("String_Node_Str",actualValue);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
  blogEntryMap.delete(null,key);
  actualValue=blogEntryMap.get(null,key,Blog.BlogEntry::getDefaultInstance);
  log.info("String_Node_Str",actualValue);
  blogEntryMap.put(null,key,Blog.BlogEntry.newBuilder().setTitle("String_Node_Str").build());
  actualValue=blogEntryMap.get(null,key);
  log.info("String_Node_Str",actualValue);
}