Correction : Clothing does mend.
It seems to be a problem in updating client with instances of what happens to your gear, ie - items being damaged/ruined.
One has to drop and reaquire them to check the state of the items.

Was attacked repeatedly by zombies and noticed that I suddenly began to cool down, my jacket was pristine, dropped it on the ground, and it was in fact ruined.

This seem to affect every item's status in one's inventory until you drop it onto the ground and reaquire them.

This seems to be the same case for Tuna Boxes, saw another report.

Bump! Still a problem on high latency servers.

Through some testing, I have figured that the issue seem to happen during high latency, ie 150+. A server closer to home does not seem to have the infinite charges on berries.

I've one hit a zombie in the head with a splitting axe just now, if no one is able to reproduce this, I'd suggest blaming latency, bad aim, or bad luck.

This is not a bug, it is an intended new feature, read the patch notes.

Aim for the head, they go down within seconds, even if you use your fists.

it has nothing to do with the condition of the cleaning kit, I used a badly damaged kit, and it still only degraded my weapons from pristine to worn quality.