While I was playing I opened up a workbench and I had exactly 140 parts, and was able to use all of them at once. After this, I opened the next workbench without picking up any parts, instead of having 0 parts I had 140 again. I looked it up and couldn't find anyone else having the same "problem". Also, I tried replicating it later on in the game but I picked up parts inbetween benches and I just had the amount of parts I picked up.
Since platting the game I've already uninstalled it, so if someone else would like to test it these are the specific workbenches it happened at