I didn't really expect for this to happen. I was messing around with the horses and spotted that.
How to trigger this bug:
1.go to a place where there is 1 block above your feet position.
2.spawn baby horses (with spawn egg)
3.wait
If horse and babies wander off, spawn more.
Environment
Windows 7 Ultimate
24th Duplicate of MC-13632, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.