When there's a 1 block high obstacle (iron bars, glass panes, enchantment table, glass, ice, or end portal block) between an angry zombie pigmen and their enemy, they will go up to the obstacle but usually won't jump over them.
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Hello again. This has been incidentally resolved because of the update to mob AI in the 14w06a snapshot and is no longer a bug. Thank-you.
Confirmed.
Seems to apply for all transparent blocks, e.g. Zombie Pigman don't jump over enchantment tables.