What I expected: Nether brick fence to behave like wood fence.
What happens: Chickens, creepers, sheep, and presumably other mobs stand at the fence and jump over and over. I guess they're trying to jump on it like a normal block.
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I also confirm, quite a big annoyance that was also present for cobblestone fences in 1.4 snapshots, but these got fixed. Nether brick fences, however, were kept broken.
All fences are 1.5 blocks tall, too high for mobs to jump on/over.
I came here to report the same bug, but I found your report first. I had to replace my wooden fence with nether brick fence. After doing this, zombies no longer path find'ed around the fence, but tried to jump over it. When I put back the wooden fence, they were smart and walked around. I remember stone walls had this issue before, so I think Mojang just forgot to apply the same fix to nether brick fences.