unity build does not use parts from deconstructing boxes

The issue

I have a box and it has 18 cp2 in it.

I' m going to build the belts next to the box to illustrate that it does not get the parts out of the deconstructing box, but the shipyard.

Expected behavior
I don't have "keep empty" on in the shipyard, and deconstructing boxes should be prioritised

To Reproduce
build the box in this save file (it's pretty easy to reproduce without the save)
p- 0.3.4-1 - prototyping some things.save

Files not imported: p- 0.3.4-1 - prototyping some things.save

I've labeled this as a feature request as this is working as intended but is a good suggestion. I'll leave it up to the devs!