There is a very similar behavior that still occurs in 13w05b, with dropped items. If you have a hopper with 1 green dye in each slot, and then drop a stack of cactus on top of the hopper, then drop a stack of green dye, the hopper will not accept the dye.
If you keep dropping dye one at a time on top of the hopper, it seems to occasionally accept one, but is mostly locked until the cacti is picked up or despawns.
Would this be considered a different bug?
It is happening to me in 14w33c. They remain permanently aggravated. I saw a pack spawn and immediately become hostile with no other pigmen around. They are also targeting me and pathfinding from large distances well in excess of their usual aggro range. I'll think they're all gone – killed by a trap door so as to try not to provoke them more – then suddenly more will come from over the horizon.