Whilst I have seen numerous entries of this nature I have seen none that follow the particular series of events that led to my towns sad downfall to a pack of hungry wolves that I could not attack.
When the goblin chief set up his happy little camp and threatened to squash my poor little residents faces I immediately caved to his demands for tribute. Thankfully he asked for some rubbish from my stockpiles so i did not mind the demand too much and nor did i mind the next one he sent after that but to my joy at the time a meddling Varanus ‘The bigger variety’ came along and devoured the now not so green killing machine that was once a Chieftain. This caused a peace between goblin and man the likes that none had seen before, that was of course until the wolves came. They bounded into my village and began devouring my stockpile and any item that happened to be lying around. But alas my villagers were still bound by the peace treaty that would last until the goblin chief came and claimed his promised goods. Which of course he never would. Being dead does tend to hinder ones ability to demand tribute.
So basically the goblins neutrality is not broken should the goblin chief die from external causes whilst the countdown to the tribute is taken is on.
This bug occurred on the steam unstable branch 2807.