During a state transfer the entries are sent batched to chunks. However, if all entries are sent in the non-last chunk, the list in entriesBySegment.get(segmentId) is empty. The code for sending last chunks is following:

OutboundTransferTask.sendEntries(...)
...
if (isLast) {
         for (int segmentId : segments) {
            List<InternalCacheEntry> entries = entriesBySegment.get(segmentId);
            if (entries == null) {
               chunks.add(new StateChunk(segmentId, InfinispanCollections.<InternalCacheEntry>emptyList(), true));
            }
         }
      }
...

See that the check is entries == null but not entries.isEmpty().
This causes to leave some segments unfinished, never finishing the state transfer.