Minecraft 1.4.2, Minecraft 1.4.6, Minecraft 1.4.7, Snapshot 13w07a
Windows 7 64bit
What I expected to happen was...:
The skeleton should be joined with the spider.
What actually happened was...:
Instead, only the spider moved, while the skeleton seemed to stay on his position. (After killing the spider, the skeleton stood there normally.)
Steps to Reproduce:
Try to find a spider jockey. (Or add some method to spawn spider jockeys and then spawn them till the bug appears.)