[A16] The packanimal is a refrigerator.

[East]

1. What the circumstances were:
When you put the food in the packanimal and cancel forming carvan

2. What happened.
1) Do not unload food out of the packanimal.
2) Food in it does not rot.
3) For example It can be used to store the remaining meat. It is a refrigerator.

3. What you expected to happen.
1) When people cancel the plan, they immediately drop the load.
2) The packanimal should not be a refrigerator.

[nccvoyager]

Not really a bug, more of an exploit.
Having food loaded on a pack animal this way stops it from rotting, but for any reason other than transit it seems like an exploitative issue.

As for the whole "pawn being a refrigerator" thing...
Food held in the "inventory" of a pawn or animal does not rot over time.
AFAIK this is WAD since it has been this way for several versions.

[East]

In the past, if this happened, it would be difficult to exploit without using the mod, but it is now possible on a large scale. Also, when canceling the caravan forming command, it is definitely a systematic bug that people do not automatically drop things from an animal's backpack even when they are in a haul waiting state.

[nccvoyager]

To summarize:
-Food carried by pack animals not rotting appears to be WAD.
-Pack animals that pick up objects (and primarily food) do not drop what was picked up when the trade caravan is cancelled.
-This second point allows exploitation of the first point.

[ZorbaTHut]

Fixed in A17. Thanks for the report!