During the process of building a Finery Forge, several materials from the build project have disappeared even after being built onto the sign-posted plan. I'd say within about an hour of them being built on by both myself and the others at the settlement, three planed boards, three pig iron and four leather are just missing. I understand items just placed into the build plan in the first column will be lost after a short amount of time - but these were certainly in the third column.
I'll admit I'm not very knowledgeable about the build mechanics; so I have to ask, is this a bug? Or a feature I was naively unaware of? Since a housing build plan nearby, with parts built onto it, has remained totally fine - but this Finery Forge has just mysteriously lost several pieces, which makes me lean towards the bug category.
Thank you.