[2020] Item duplication bug

Hi, enjoying the game and looking forward to updates, but I came across a bug that I haven't seen talked about online.

While playing ancients, I had an iron pickaxe (2 handed) equipped to one of my ancient settlers. A bandit tried to attack my settlement, so I went to switch the pickaxe on my settler to a spellbook of cleaving (another 2 handed tool) using the T menu to drag and drop the item onto the settler's uniform. while switching the settler was engaged in combat with the bandit, so i moved the settler out of combat with a move command while summons killed the bandit.

Afterwards, my settler had the two handed pickaxe equipped in one hand and was having trouble doing tasks and was idle while there were jobs he could do. When I tried to switch the pickaxe with the spellbook again, the settler only stood over the spellbook without doing anything.

I was finally able to unequip the now one handed pickaxe by having him switch to another tool (a 2 handed fishing rod) which seemed to solve my issue.

However, once he switched he seemed to stand still for quite some time with the "working" description. It wasn't until I went up a z-level that I realized that my roof was now full of 2 handed iron pickaxes. It seems that he had somehow duplicated the item every time I told him to switch to the spellbook, and was now "unequiping" all of the duplicates.

I'd also like to know if there is anyway to preset skill preferences for new settlers or summonings? Since imps have such a short shelf life and can level up, I want them focused on mining, but my voidspawn come into the world with mining activated, so everytime I summon one (so that they don't take a mining job from an imp), I have to deselect the mining skill from them. It's not a big issue, just a mild annoyance.