Sorry for my funny english, i'm french and i don't speak very well…

With 32 wooden planks, I make doors, and offers well established 3 doors in series of six wooden planks.

32 / 6 * 3 = 16 doors

I have a free place in my inventory (just one !), and i validate by Shift + Clik…

The new 16 wooden doors are now in my inventory and they are stacked.

Now, i open a chest and all the stacked-doors are immediately unstacked and moved on, one by one on a free cell, but, only 7 doors survive, the 9 other just… disappear (well, if you understand this !).

[In french]
Les portes sont bien empilées dans mon inventaire personnel, mais dès que j'ouvre le coffre, elles se déplacent d'elles même dedans, chacune occupant un espace libre du coffre.

Mais surtout, je n'ai plus que 7 portes, les autres ont tout simplement disparues.
[/In french]

Unable to stack the doors manually, the behavior is absolutely inconsistent and very random…