Guild Wars 2

Weird little bug I encountered. While chopping an Orrian sapling with an orichalcum logging axe, I decided to swap out my Orichalcum mining pick for a mithril mining pick in preparation for mining a nearby mithril ore node. Immediately upon the swap, one of my mithril picks was consumed (went down from 100 to 99—actually saw the number decrease) and even yielding a ruined log instead of an ancient log.

So the game actually confused a mining pick for a logging axe briefly and used the wrong tool. Interestingly, this only occurred during my second swing. The first swing used the orichalcum logging axe, the second the false mithril pick, and the third, without interrupting my harvesting, used an axe again and yielded an ancient log.

This just happened to me! was mining ancient tree with ori axe, switch my ori mining pick for mithril mining pick, then I got ruined log. I didn’t notice if the pick was consumed but my game messages log looks like this:
You receive 2 Orichalcum Ore.
You receive 1 Ancient Mining Pick.
You receive 1 Ruined Log.
You received 1 Ruined Log.
You receive 1 Ancient Wood Log.

I got that last log because the tree stuck around for a 2nd chance of harvesting, though only 1 strike at it.