So, i accidentally managed to get some iron plates into my character inventory. What I was doing when I encountered this bug was changing the recipe in the assembler and it somehow put the iron plates into my inventory rather than in the assembler output inventory. I figured this might be a base factorio issue but I'd figured I'd share in case there's something that could be figured out. https://i.imgur.com/lF1DflZ.jpeg
For some reason actually changing the recipe moves items from the assembler to the player's inventory. Will close the inventory with items that can't be removed. Will be in 1.0.3