Summary says it all: shooting zombie pigman with the bow is super-safe in 1.5.2 - he do not become agressive. Other pigmen also do not become aggressive.
When attacked with the sword they become aggressive as usual.
This may also happened once for me in 1.5.1, but I have to confirm it.
Comments 3
I made some more testing and seems that you are right - they are getting agressive.
But there is one more thing: one can shoot a group of zombie pigmen from some distance (probably specified somewhere on the wiki) and they won't attack, unless player gets close enough before finishing them off.
I just forgot about that behavior since zombies in the owerworld now (since 1.5?) attack from far away when attacked using a bow.
So thats probably intended, since zombie pigmen were always a bit more stupid that regular zombies (no pathfinding etc).
Unable to reproduce.